Abstract
A wide range of novelties and significant developments in the field of veterinary science to treat helminth parasites by using natural plant products have been assessed in recent years. To the best of our knowledge, to date, there has not been such a comprehensive review of 19 years of articles on the anthelmintic potential of plants against various types of helminths in different parts of the world. Therefore, the present study reviews the available information on a large number of medicinal plants and their pharmacological effects, which may facilitate the development of an effective management strategy against helminth parasites. An electronic search in four major databases (PubMed, Scopus, Web of Science, and Google Scholar) was performed for articles published between January 2003 and April 2022. Information about plant species, local name, family, distribution, plant tissue used, and target parasite species was tabulated. All relevant studies meeting the inclusion criteria were assessed, and 118 research articles were included. In total, 259 plant species were reviewed as a potential source of anthelmintic drugs. These plants can be used as a source of natural drugs to treat helminth infections in animals, and their use would potentially reduce economic losses and improve livestock production.
Keywords: ethnomedicine, anthelmintic, medicinal plant, helminth, global distribution
1. Introduction
Livestock production plays a key role in the economic development of a country. Helminthiasis caused by a helminth infection is a major constraint in global livestock production. The mortality and morbidity in animal populations owing to infections caused by parasitic helminths are rapidly increasing worldwide [1]. These parasitic worms are categorized into two major groups: roundworms (phylum Nematoda) and flatworms (phylum Platyhelminthes) [2]. Among these parasites, gastrointestinal parasites pose a serious threat to livestock production. In recent decades, continuous and intensive use of synthetic anthelmintics has been the only method to control gastrointestinal nematodes. However, resistance to all available anthelmintic drug classes has been reported in livestock species. Resistance to an anthelmintic drug is often observed within a few years of introduction of the drug, indicating a remarkably high rate of resistance development, which likely results from a combination of large, genetically diverse parasite populations, and strong selection pressure for resistance. Plants are an ideal source of naturally occurring compounds that can be used as alternative dewormers in livestock [3]. Recently, some anthelmintics have demonstrated loss of efficacy owing to anthelmintic resistance [4]; as a result, parasitic load progressively increases, leading to high mortality and morbidity. Traditional use of medicinal plants for controlling helminth infections is more acceptable owing to the eco-friendly nature and sustainable supply of medicinal plants [5].
The present review is a comprehensive approach to show a geographical distribution of medicinal plants in a given time period and their anthelmintic potential, which would facilitate their use as an effective management strategy against helminth parasites. An electronic search in four major databases (PubMed, Scopus, Web of Science, and Google Scholar) was performed for data published between January 2003 and April 2022. Using database-specific strings, different combinations of the following keywords were used: “anthelmintic activity of plants”, “gastrointestinal nematodes”, “Platyhelminthes”, “roundworms”. The studies were required to include information about plant species, local name, plant family, distribution, plant tissue used, and target parasite species. The PRISMA (Preferred Reporting Items for Systematic Reviews and Meta-Analyses) statement [6] was used as a guide. Prespecified outcome-specific quality criteria were used to judge the admission of each qualitative and quantitative outcome into the appropriate analysis. Two investigators independently reviewed each eligible study and extracted the information and data necessary to carry out the qualitative analysis and the meta-analysis. Disagreements were resolved by consensus among all authors. All relevant studies meeting the criteria were assessed. In some references, multiple lines were used to show them because the authors were working on multiple plant species in the same article. In total, 2202 articles were obtained. However, since not all of them could be included in the current review, it was reduced to 118 articles by sampling (by paying attention to different countries and different plant species and parasites) and used in this review (Figure 1). Finally, 259 plant species from 36 countries worldwide were reviewed as a potential source of anthelmintic drugs. The distribution of the articles used in this review by country is shown in Figure 1.
Figure 1.
The PRISMA chart showing the summary of the literature search and query results.
The details of anthelmintic plants and their extracts potentially effective against Platyhelminthes and Nematoda are presented in Table 1 and Table 2, respectively.
Table 1.
List of anthelmintic plants and their extracts effective against flatworms (Platyhelminthes).
| Parasite | Study Model | Plant Family | Plant Name | Plant Tissue | Extract | Effective Concentration and Mortality Rate (%) | Reference |
|---|---|---|---|---|---|---|---|
| Carmyerius spatiosus | In vitro | Leguminosae | Cassia siamea | Leaves and heartwood | Ethyl acetate extracts | Highest anthelminthic effect | [7] |
| Plumbaginaceae | Plumbago zeylanica | Roots | n-butanol extract | ||||
| Plumbaginaceae | Plumbago indica | Roots | hexane, ethyl acetate, and n-butanol extract | ||||
| Combretaceae | Terminalia catappa | Leaves | n-butanol and water extract | ||||
| Clonorchis sinensis | In vitro | Rosaceae | Hagenia abyssinica | Female flowers | Crude extract | 5 h (100 µg/mL) | [8] |
| Echinococcus granulosus (protoscolex) | In vitro | Anacardiaceae | Pistacia atlantica | Fruits and leaves | Hydroalcoholic extracts | 100%; killed protoscoleces (50 mg/mL in 10 min) | [3] |
| Leaves and fruits | Hydroalcoholic extracts | 0.1% concentration of fresh fruit extract (99.09 ± 1.27 mg/mL) and leaf extract (89.25 ± 18.42 mg/mL) had strong scolicidal effects in 360 min | [9] | ||||
| In vitro | Lamiaceae | Salvia officinalis | Aerial parts | Ethanolic extract | 100% (6–8 days) | [10] | |
| Fabaceae | Prosopis farcta | Leaves | Ethanolic extract Crude alkaloids |
25% scolicidal activity with a 500 mg/mL dose after 24 h | [11] | ||
| 57% scolicidal activity with a 500 mg/mL dose after 24 h | |||||||
| Ranunculaceae | Nigella sativa | Seeds | Essential oil (Thymoquinone) | 100% scolicidal activity with a 1 mg/mL dose after 10 min | [12] | ||
| Cucurbitaceae | Dendrosicyos socotrana | Leaves | Aqueous and methanolic extracts | 100% scolicidal activity with a 5000 μg/mL dose after 360 h (methanolic extract) and 408 h (aqueous extract) |
[13] | ||
| Euphorbiaceae | Jatropha unicostata | Aqueous and methanolic extracts | 100% scolicidal activity with a 1000 μg/mL dose after 288 h (both extracts) |
||||
| Berberidaceae | Berberis vulgaris | Fruits | Aqueous extracts | 98.7% scolicidal activity with a 2 mg/mL dose after 30 min |
[14] | ||
| Euphorbiaceae | Mallotus philippinensis | Fruits | Methanolic extracts | 99% scolicidal activity with a 20 mg/mL dose after 60 min |
[15] | ||
| Echinococcus granulosus protoscolex | In vitro | Meliaceae | Azadirachta indica | Whole plant | Ethanolic extracts | Up to 97% mortality with 30 min of incubation | [16] |
| Echinostoma caproni | In vitro | Rosaceae | Hagenia abyssinica | Female flowers | Crude extract | 51 h (100 µg/mL) | [8] |
| Fasciola hepatica | In vitro | Fabaceae | Acacia farnesiana | Leaves | Hexane, ethyl acetate, and methanolic extracts | 0% (500 mg/L) | [17] |
| Asteraceae | Artemisia absinthium | 0% (500 mg/L) | |||||
| Artemisia mexicana | 100% (500 mg/L) | ||||||
| Papaveraceae | Bocconia frutescens | 100% (500 mg/L) | |||||
| Fabaceae | Cajanus cajan | 100% (500 mg/L) | |||||
| Boraginaceae | Cordia spp. | 0% (500 mg/L) | |||||
| Malvaceae | Hibiscus rosa sinensis | 0% (500 mg/L) | |||||
| Verbenaceae | Lantana camara | 100% (500 mg/L) | |||||
| Fabaceae | Leucaena diversifolia | 0% (500 mg/L) | |||||
| Meliaceae | Melia azedarach | 13% (500 mg/L) | |||||
| Lamiaceae | Mentha sp. | 0% (500 mg/L) | |||||
| Ocimum basilicum | 0% (500 mg/L) | ||||||
| Piperaceae | Piper auritum | 100% (500 mg/L) | |||||
| Dysphania | Teloxys ambrosioides | 0% (500 mg/L) | |||||
| Fasciola larvae (sporocyst, redia, and cercaria) | In vitro | Rosaceae | Potentilla fulgens | Dried root powder | Ether, chloroform, methanolic, acetone, and ethanolic extracts | 8 h LC50 was 54.20 mg/L for sporocysts, 49.37 mg/L for redia, and 38.13 mg/L for cercaria | [18] |
| Fasciola gigantica larvae (sporocysts, redia, and cerceria) | In vivo | Asparagaceae | Asparagus racemosus | Dried root powder | Ether, chloroform, methanolic, acetone, and ethanolic extracts | 2 h LC50 was 79.93% | [19] |
| Fasciola gigantica and Taenia solium | In vitro | Euphorbiaceae | Acalypha wilkesiana | Extracts | Methanolic extracts of leaves, stems, and roots | All extracts exhibited anthelmintic activity in vitro | [20] |
| Fasciola hepatica | In vitro | Rosaceae | Hagenia abyssinica | Female flowers | Crude extract | 1 h (100 µg/mL) | [8] |
| Fasciolopsis buski | In vitro | Zingiberaceae | Alpinia nigra | Shoot | Crude alcoholic extract | 3.94 ± 0.06 h death time (20 mg/mL concentration) | [21] |
| Gastrothylax crumenifer | In vitro | Fabaceae | Sesbania sesban var. bicolor | Fresh leaves | Methanolic extracts of dried plants | Better than praziquantel | [22] |
| Cyperaceae | Cyperus compressus | Roots | |||||
| Asparagaceae | Asparagus racemosus | Roots | |||||
| Hymenolepis diminuta and Syphacia obvelata | In vitro In vivo |
Asparagaceae | Asparagus racemosus | Roots | Methanolic extract | 53.88% and 24% reduction in EPG * and worm counts, respectively (30 mg/mL concentration) | [23] |
| Hymenolepis diminuta | In vitro | Cyperaceae | Cyperus compressus | Roots | Methanolic extract | 61.74% reduction in the EPG and 24% reduction in worm counts (30 mg/mL concentration) | [24] |
| Hymenolepis diminuta | In vitro | Fabaceae | Sesbania sesban | Fresh Leaves | Methanolic extract | 65.10% reduction in EPG counts, 56% reduction in worm counts (30 mg/mL concentration) |
[25] |
| Paramphistomum gracile | In vitro | Fabaceae | Senna alata, S. alexandrina, and S. occidentalis | Leaf extract | Ethanolic extracts | Dose-dependent effects on motility and mortality | [26] |
| Paramphistomum microbothrium | In vitro | Zygophyllaceae | Balanites aegyptiaca | Fruits | Methanolic extract | 200 µg/ml, at which distinct damage to the whole body surface of the trematodes |
[27] |
| Raillietina echinobothrida | In vitro | Asteraceae | Acmella oleracea | Leaves | Methanolic extract | 18.42 ± 0.95 h survival time (20 mg/mL concentration) | [28] |
| Raillietina spiralis | In vitro | Malvaceae | Thespesia lampas | Roots | Aqueous extracts | 51 ± 0.33 min death time (20 mg/mL concentration) | [29] |
| Raillietina spiralis | In vitro | Meliaceae | Azadirachta Indica | Leaves | Aqueous extract | 46 ± 0.53 min death time (20 mg/mL concentration) | [30] |
| Raillietina spiralis | In vitro | Scrophulariaceae | Verbascum Thapsus | Fresh Leaves | Methanolic extract | 86 ± 5 min death time (20 mg/mL concentration) | [31] |
| Raillietina spiralis | In vitro | Asteraceae | Achillea wilhelmsii | Fresh Leaves | Methanolic extract | 40 min death time (20 mg/mL concentration) | [32] |
| Raillietina spiralis | In vitro | Lauraceae | Cinnamomum camphora | Leaves | Aqueous extracts | 47 ± 0.54 min death time (20 mg/mL concentration) | [33] |
| Raillietina spiralis | In vitro | Verbenaceae | Clerodendron inerme | Leaves | Aqueous extracts | 45 ± 0.52 min death time (20 mg/mL concentration) | [34] |
| Raillietina tetragona | In vitro | Poaceae | Imperata cylindrica | Underground parts (rhizomes and roots) | Chloroform (medium polar solvent) | Dose-dependent anthelmintic activity | [35] |
| Schistosoma mansoni | In vitro | Apocynaceae | Rauwolfia vomitoria | Stem bark and roots | Ethanolic extract | High activity against cercariae and adult worms | [36] |
| Syphacia obvelata | In vitro | Cyperaceae | Cyperus compressus | Roots | Methanolic extract | 28.92% reduction in the EPG and 33.85% reduction in worm counts (30 mg/mL concentration) | [24] |
| Syphacia obvelata | In vitro | Fabaceae | Sesbania sesban | Fresh leaves | Methanolic extract | EPG and worm counts reduced by 34.32% and 47.08%, respectively (30 mg/mL concentration) |
[25] |
| Schistosoma mansoni | In vivo | Asteraceae | Baccharis trimera | Leaves | Crude dichloromethane extract (DE) and aqueous fraction (AF) | 98% (AF) 97% (DE) | [37] |
| Tanacetum vulgare | Aerial parts | Crude extract and Essential oil | 100% | [38] | |||
| Schistosoma mansoni | In vitro | Rosaceae | Hagenia abyssinica | Female flowers | Crude extract | 3 h (100 µg/mL) | [8] |
| Schistosoma mansoni | In vitro | Euphorbiaceae | Euphorbia conspicua | Leaves | Leaf extract | 100% (100 µg/mL) |
[39] |
| Piperaceae | Piper chaba | Fruits | Methylene chloride extract | Strongest activity | [40] | ||
| Taenia solium | In vitro | Asclepiadaceae | Pergularia daemia | Leaves | Ethanolic extract | 210.00 ± 0.52 min death time (25 mg/mL concentration) | [41] |
| Aqueous extract | 221.12 ± 0.61 | ||||||
| Taenia tetragona | In vitro | Asteraceae | Acmella oleracea | Leaves | Hexane extract | The lethal concentration (LC50) of the plant extract was 5128.61 ppm on T. tetragona and 8921.50 ppm on A. perspicillum | [42] |
* EPG: Egg per gram.
Table 2.
List of anthelmintic plants and their extracts effective against roundworms (Nematoda).
| Parasite | Study Model | Plant Family | Plant Name | Plant Part Used | Extract/Compound | LC50 * | References |
|---|---|---|---|---|---|---|---|
| Allolobophora caliginosa | In vitro | Fabaceae | Indigofera oblongifolia | Leaves | Leaf extracts | 15 ± 2 and 8.6 ± 1 h survival time with leaf extracts at 200 mg/mL and 300 mg/mL, respectively | [43] |
| Ancylostoma caninum, Haemonchus placei, andCyathostomins | In vivo | Ebenaceae | Diospyros anisandra | Leaves and bark | Extracts and active compounds | Wide-spectrum anthelmintic activity | [44] |
| Ascardia galli | In vitro | Malvaceae | Thespesia lampas | Roots | Aqueous extracts | 43 ± 0.86 min death time (20 mg/mL concentration) | [29] |
| Ascardia galli | In vitro | Mimosaceae | Acacia oxyphylla | Fresh stems | Ethanolic extracts | 55.17 h ± 1.04 h death time (0. 5 mg/ mL concentration) | [45] |
| Ascardia galli | In vitro | Meliaceae | Azadirachta Indica | Leaves | Aqueous extract | 46 ± 0.26 min death time (20 mg/mL concentration) | [30] |
| Ascardia galli | In vitro | Scrophulariaceae | Verbascum Thapsus | Fresh Leaves | Methanolic extract | 81 ± 4 min death time (20 mg/mL concentration) | [31] |
| Ascardia galli | In vitro | Asteraceae | Achillea wilhelmsii | Fresh Leaves | Methanolic extract | 40 min death time (20 mg/mL concentration) | [32] |
| Ascardia galli | In vitro | Lauraceae | Cinnamomum camphora | Leaves | Aqueous extracts | 52 ± 0.43 min death time (20 mg/mL concentration) | [33] |
| Ascardia galli | In vitro | Verbenaceae | Clerodendron inerme | Leaves | Aqueous extracts | 50 ± 0.31 min death time (20 mg/mL concentration) | [34] |
| Ascardia galli and Pheretima posthuma | In vitro | Malvaceae | Malvastrum coromandelianum | Leaves | Methanolic and ethyl acetate extracts | Significant anthelmintic activity | [46] |
| Ascaris lumbricoides | In vitro | Musaceae | Musa paradisiaca, M. sapientum, and M. nana | Roots | Methanol root extracts | Death time 151.39 ± 0.1 min at 200 mg/mL | [47] |
| Ascaris lumbricoides | In vitro | Asclepiadaceae | Pergularia daemia | Leaves | Ethanolic Extract | 98.42 ± 0.57 min death time (25 mg/mL concentration) | [41] |
| Aqueous Extract | 109.91 ± 0.49 min death time (25 mg/mL concentration) | ||||||
| Ascaris suum L3 larvae | In vitro | Lythraceae | Punica granatum | Fruit Peel | Ethanolic extracts | EC50 values 164% | [48] |
| Rutaceae | Zanthoxylum zanthoxyloides | Roots | EC50 values 97% | ||||
| Rutaceae | Clausena anisata | Roots | EC50 values 74% | ||||
| Ascaris suum L3 larvae | In vitro | Acetone/water extracts | Ascaris suum L3 migratory inhibition activity EC50 ** values | [49] | |||
| Pinaceae | Pinus sylvestris | Bark | 48.2% | ||||
| Fabaceae | Onobrychis viciifolia | Whole plant | 41.9% | ||||
| Fabaceae | Trifolium repens | Flowers | 98.4% | ||||
| Grossulariaceae | Ribes nigrum | Leaves | 91.8% | ||||
| Ribes rubrum | Leaves | 86% | |||||
| Brugia malayi | In vivo | Piperaceae | Piper betle | Leaves | Methanolic extracts | Moderate activity | [50] |
| Brugia malayi | In vitro/ In vivo |
Apiaceae | Trachyspermum ammi | Dried fruits | Methanolic extracts | 58.93% | [51] |
| Brugia malayi | In vivo | Caesalpiniaceae | Caesalpinia bonducella | Seed kernels | Ethanolic extracts | 96.0% microfilaricidal and 100% sterilization in females |
[52] |
| Butanolic extracts | |||||||
| Aqueous fraction | |||||||
| Brugia malayi | In vivo/ In vitro |
Verbenaceae | Lantana camara | Stem | Ethanolic extracts | 43.05% adulticidal activity; sterilization of 76% of surviving females |
[53] |
| Brugia pahangi | In vitro | Asteraceae | Neurolaena lobata | Leaves | Ethanolic extracts | Completely immotile after 24 h incubation at 500 μg/mL concentration | [54] |
| Caenorhabditis elegans | In vitro | Laminaceae | Tetradenia riparia | Leaves | Ethyl acetate extracts | Most effective minimum lethal concentration value was 0.004 mg/mL | [55] |
| Caenorhabditis elegans | In vitro | Combretaceae | Anogeissus leiocarpus | Stem bark | Ethanolic extracts | 72 h LC50 was between 0.38 and 4.00 mg/mL | [56] |
| Meliaceae | Khaya senegalensis | Leaves | |||||
| Euphorbiaceae | Euphorbia hirta | ||||||
| Annonaceae | Annona senegalensis | Aqueous extracts | |||||
| Apocynaceae | Parquetina nigrescens | ||||||
| Caenorhabditis elegans | In vitro | Sapindaceae | Acer rubrum | Leaves | Ethanolic extracts | Killed 50% (LC50) or 90% (LC90) of the nematodes in 24 h | [57] |
| Fagaceae | Quercus alba | ||||||
| Rosaceae | Rosa multiflora | ||||||
| Anarcardiaceae | Rhus typhina | ||||||
| Fabaceae | Robinia pseudoacacia | ||||||
| Lespedeza cuneata | Leaves and stems | ||||||
| Caenorhabditis elegans | In vitro | Meliaceae | Khaya senegalensis | Stem bark | Ethanolic and aqueous extracts | 72 h LC50 was between 0.38 and 4.00 mg/mL | [56] |
| Combretaceae | Anogeissus leiocarpus | Leaves | |||||
| Euphorbiaceae | Euphorbia hirta | ||||||
| Annonaceae | Annona senegalensis | ||||||
| Apocynaceae | Parquetina nigrescens | ||||||
| Fabaceae | Senna petersiana | ||||||
| Caenorhabditis elegans | In vitro | Plumbaginaceae | Plumbago indica | Root | Methylene chloride | Strongest activity | [40] |
| Cooperia spp. | In vitro | Fabaceae | Leucaena leucocephala | Fresh leaves | Aqueous extract | 52.02 ± 12.39 of egg hatching within 48 h of exposure | [58] |
| Eudrilus eugeniae | In vitro | Lamiaceae | Ocimum basilicum | Fruits | Ethanol and hexane extracts | 213.39 ± 1.05 and 362.98 ± 1.54 death time of ethanolic extract and hexane extract, respectively, at 250 μg/mL concentration | [59] |
| Gastrointestinal nematodes | In vitro/ In vivo |
Lamiaceae |
Prunella vulgaris
|
Whole plant | Phenolic compounds | Highest nematode motility (100%) with higher concentrations of methanolic extracts (50 mg/ mL) | [60] |
| Gastrointestinal nematodes |
In vivo |
Lythraceae | Punica granatum | Fruit peel |
Pomegranate peel extract |
7 days after the first and second doses, 85–97% decrease in fecal egg count (FEC) | [61] |
| Gastrointestinal nematodes | In vitro | Moringaceae | Moringa oleifera lectin | Seeds | Distilled water homogenization | 40.4% of eggs unhatched at 250 μg/mL dose | [62] |
| Gastrointestinal nematodes | In vitro | Phyllanthaceae | Bridelia ferruginea | Leaves | Methanolic and acetone extracts |
The number of eggs that hatched was reduced in a concentration-dependent manner (p < 0.01) upon treatment | [63] |
| Combretaceae | Combretum glutinosum | ||||||
| Rubiaceae | Mitragyna inermis | ||||||
| Gastrointestinal nematodes of goats | In vitro | Vitaceae | Cissus quadrangularis | Aerial parts | Aqueous (cold and boiled) and methanolic extracts | Statistically significant effect | [64] |
| Asphodelaceae | Aloe marlothii | Leaves | |||||
| Mimosoideae | Albizia anthelmintica | Bark | |||||
| Vitaceae | Cissus rotundifolia | Bark | |||||
| Anacardiaceae | Sclerocarya birrea | Bark | |||||
| Fabaceae | Vachellia xanthophloea | Bark | |||||
| Gastrointestinal nematodes of sheep | In vivo | Punicaceae | Punica granatum | Fruit (seeds and peel) | Boiled extracts | 8–40% (21st day) | [65] |
| Asteraceae | Artemisia campestris | Whole plant | 3–36% (21st day) | ||||
| Salicaceae | Salix caprea | Bark and leaves | 7–40% (21st day) | ||||
| Gastrointestinal nematodes of sheep | In vitro | Myrtaceae | Psidium cattleianum | Fruits | Hydroalcoholic extract | 80% in the inhibition of larval migration | [66] |
| Gastrointestinal nematodes of sheep | In vitro | Punicaceae | Aqueous Pomegranate | Fruit pulp | Methanolic and gallic acid extracts | Significant inhibition of egg hatching within 48 h of exposure, highlighting a high (>82%) efficacy in vitro at all tested doses | [67] |
| Gastrothylax crumenifer | In vitro | Menispermaceae | Tinospora cordifolia | Plant stems | Alcoholic and aqueous extracts | mortality rate of 100% at concentration of 100 mg/mL | [68] |
| Haemonchus contortus | In vitro | Asteraceae | Artemisia maritima | Whole plants | Methanolic extracts | 84.5% | [69] |
| Artemisia vestita | 87.2% | ||||||
| Haemonchus contortus | In vitro | Ericaceae | Arctostaphylos uva-ursi | Leaves | Methanolic extracts | 95.8 ± 0.5% inhibition in DMSO | [70] |
| Anacardiaceae | Rhus glabra | 90.2 ± 0.9% inhibition in DMSO |
|||||
| Asteraceae | Balsamorhiza sagittata | 88.1 ± 1.2% inhibition in DMSO | |||||
| Ranunculaceae | Caltha palustris | 86.5 ± 1.2% inhibition in DMSO | |||||
| Boraginaceae | Cynoglossum officinale | 84.7 ± 1.0% inhibition in DMSO | |||||
| Asteraceae | Solidago mollis | 82.8 ± 1.4% inhibition in DMSO |
|||||
| Asteraceae | Centaurea stoebe | 78.1 ± 1.5% inhibition in DMSO | |||||
| Fabaceae | Glycyrrhiza lepidota | 77.6 ± 2.3% inhibition in DMSO | |||||
| Anacardiaceae | Rhus aromatica | 100% inhibition in DMSO | |||||
| Asteraceae | Ericameria nauseosa | 100% inhibition in DMSO | |||||
| Apiaceae | Perideridia gairdneri | 100% inhibition in DMSO | |||||
| Geraniaceae | Geranium viscosissimum | 100% inhibition in DMSO | |||||
| Asteraceae | Chrysothamnus viscidiflora | 100% inhibition in DMSO | |||||
| Asteraceae | Liatris punctata | Roots | 100% inhibition in DMSO | ||||
| Fabaceae | Melilotus alba | Leaves | 100% inhibition in DMSO | ||||
| Fabaceae | Melilotus officinalis | 100% inhibition in DMSO | |||||
| Papaveraceae | Sanguinaria canadensis | Roots | 98.5 ± 0.3% inhibition in DMSO |
||||
| Orobanchaceae | Pedicularis racemosa | Leaves | 74.2 ± 0.9% inhibition in DMSO | ||||
| Lamiaceae | Stachys palustris | 72.9 ± 1.8% inhibition in DMSO | |||||
| Lamiaceae | Agastache foeniculum | 70.05 ± 0.7% inhibition in DMSO | |||||
| Lamiaceae | Monarda fistulosa | 69.5 ± 1.5% inhibition in DMSO | |||||
| Fabaceae | Pediomelum argophyllum | 69.7 ± 1.8% inhibition in DMSO | |||||
| Lamiaceae | Lycopus americanus | 76.0 ± 2.3% inhibition in DMSO | |||||
| Ranunculaceae | Clematis ligusticifolia | 68.7 ± 2.0% inhibition in DMSO | |||||
| Amaryllidaceae | Allium cernuum | 68.4 ± 1.3% inhibition in DMSO | |||||
| Asteraceae | Conyza canadensis | 76.8 ± 2.1% Inhibition in MOPS | |||||
| Cornaceae | Cornus sericea | 57.4 ± 3.1% inhibition in DMSO | |||||
| Rosaceae | Rubus idaeus | 51.9 ± 1.6% inhibition in DMSO | |||||
| Ranunculaceae | Actaea rubra | 45.2 ± 1.5% Inhibition in DMSO | |||||
| Caprifoliaceae | Symphoricarpos occidentalis | 43.1 ± 3.3% Inhibition in DMSO | |||||
| Asteraceae | Artemisia ludoviciana | 40.8 ± 2.0% inhibition in DMSO | |||||
| Asteraceae | Artemisia frigida | 36.2 ± 1.65% inhibition in DMSO | |||||
| Asteraceae | Tanacetum vulgare | 33.5 ± 2.0% inhibition in DMSO | |||||
| Cleomaceae | Cleome serrulata | 23.9 ± 1.7% Inhibition in DMSO | |||||
| Onagraceae | Epilobium angustifolium | 23.2 ± 3.5% inhibition in DMSO | |||||
| Fagaceae | Quercus macrocarpa | 18.3 ± 2.2% Inhibition in DMSO | |||||
| Salicaceae | Salix exigua | 5.9 ± 0.7% Inhibition in DMSO |
|||||
| Haemonchus contortus | In vitro | Asteraceae | Artemisia absinthium | Leaves | Crude aqueous and ethanolic extracts | Aqueous extracts exhibited greater anthelmintic activity | [71] |
| Haemonchus contortus | In vitro | Rutaceae | Citrus aurantifolia | Essential oils from fruit peel | Oil extracts | Oil has limonene (56.37%), β-pinene (11.86%) and γ-terpinene (11.42%) | [72] |
| Annonaceae | Annona muricata | Leaves | Aqueous extracts | Aqueous extract of A. muricata leaves at serial dilutions of 50%, 25%, 12.5% and 6.25% inhibited the motility of L3 by 83.29%, 89.08%, 74.62% and 30.47% respectively | |||
| Haemonchus contortus | In vitro | Anacardiaceae | Myracrodruon urundeuva | Seeds | Ethanolic and hexane extracts | Inhibition of larval development (LC50 = 0.29 mg mL−1) | [73] |
| Haemonchus contortus | In vitro | Liliaceae | Allium sativum | Bulbs | Ethanolic extracts | 84.0 ± 4.3 | [74] |
| Asphodelaceae | Aloe ferox | Leaves | 86.9 ± 2.9 | ||||
| Bromeliaceae | Ananas comosus | 100 ± 1.0 | |||||
| Caricaceae | Carica papaya | 76.0 ± 5.1 | |||||
| Moraceae | Ficus benjamina | 78.1 ± 3.5 | |||||
| Moraceae | Ficus ingens | 78.1 ± 5.7 | |||||
| Moraceae | Ficus carica (brown) | 56.3 ± 2.8 | |||||
| Moraceae | Ficus carica (white) | 74.1 ± 7.9 | |||||
| Moraceae | Ficus indica | 44.5 ± 7.0 | |||||
| Moraceae | Ficus lutea | 60.0 ± 6.3 | |||||
| Moraceae | Ficus elastica | 77.8 ± 6.6 | |||||
| Moraceae | Ficus natalensis | 68.8 ± 7.2 | |||||
| Moraceae | Ficus sur | 81.3 ± 5.6 | |||||
| Moraceae | Ficus sycomorus | 6.3 ± 4.3 | |||||
| Moraceae | Ficus ornamental thai | 60.0 ± 1.7 | |||||
| Lamiaceae | Leonotis leonurus | 56.5 ± 6.1 | |||||
| Moraceae | Melia azedarach | 66.7 ± 4.4 | |||||
| Fabaceae | Peltophorum africanum | 65.2 ± 4.0 | |||||
| Amaryllidaceae | Scadoxus puniceus | 59.4 ± 8.2 | |||||
| Fabaceae | Lespedeza cuneata | 100 ± 1.6 | |||||
| Leguminosae | Tephrosia inandensis | 64.0 ± 7.8 | |||||
| Canellaceae | Warburgia ugandensis | 81.5 ± 3.5 | |||||
| Canellaceae | Warburgia salutaris | 80.8 ± 3.4 | |||||
| Cucurbitaceae | Cucumis myriocarpus | 60.0 ± 5.7 | |||||
| Zingiberaceae | Zingiber officinale | Rhizomes | 72.0 ± 2.5 | ||||
| Haemonchus contortus | In vitro | Asteraceae | Vernonia amygdalina | Leaves | Hot water extracts | Ineffective | [75] |
| Annonaceae | Annona senegalensis | Stem barks | 88.5% | ||||
| Haemonchus contortus | In vivo | Fabaceae | Acacia nilotica | Leaves | Without extraction | 10% reduction in worm | [76] |
| Acacia karroo | 34% reduction in worm | ||||||
| Haemonchus contortus | In vitro and In vivo |
Amaranthaceae | Chenopodium ambrosioides | Leaves and stems | Organic maceration | 96.3% (invitro), 45.8% (in vivo) at 40 mg/mL dose | [77] |
| Simaroubaceae | Castela tortuosa | 78.9% (in vitro) 27.1% (in vivo) at 20 mg/mL dose | |||||
| Haemonchus contortus | In vivo and In vitro |
Lamiaceae | Mentha pulegium | Aerial parts | Hydroethanolic extract | 91.58% inhibition in the egg hatch assay at 8 mg/mL after 48 h. 65.2% inhibition at 8 mg/mL after 8 h in adult worm motility | [78] |
| Haemonchus contortus | In vitro | Apocynaceae | Tylophora Indica | Leaves | Methanolic extract | 100% mortality after 6 h exposure at 50 mg/mL of concentration | [79] |
| Haemonchus contortus | In vitro | Passifloraceae | Turnera ulmifolia | Leaves and roots | Hydroacetonic and hydroalcoholic extracts | The highest egg hatching inhibition with the lowest LC50 value of 430 μg/mL (95%, CI 400–460 μg/mL) | [80] |
| Fabaceae | Parkia platycephala | Leaves and seeds | LC50 1340, 95% CI 1170-1550 μg/mL | ||||
| Fabaceae | Dimorphandra gardneriana | Leaves and bark | Ineffective | ||||
| Haemonchus contortus | In vitro | Lauraceae | Persea americana | Dried seeds | Hot water extracts | 76.9 ± 7.2% effective in 500 μg/mL dose | [81] |
| Haemonchus contortus | In vitro and In vivo |
Asteraceae | Artemisia absinthium | Whole plant | Crude methanolic extracts | Strong anthelmintic effect | [82] |
| Malvaceae | Malva sylvestris | ||||||
| Haemonchus contortus | In vitro | Asteraceae | Artemisia herba-alba | Stems and leaves | Crude methanolic extracts | 98.67% inhibition of egg hatching at 1 mg/mL concentration | [83] |
| Punicaceae | Punica granatum | Peel and roots | Eggs unhatched at the end of the observation period | ||||
| Haemonchus contortus | In vitro | Asteraceae | Artemisia vulgaris | Leaves | Aqueous and ethanolic extracts | %100 | [84] |
| Haemonchus contortus | In vitro | Fagaceae | Castanea sativa | Stems and leaves | Ethanolic extracts | All plants showed some anthelmintic activity on both L3 larvae and adult worms) | [85] |
| Fabaceae | Sarothamnus scoparius | Stems and leaves | |||||
| Pinaceae | Pinus sylvestris | Stems and leaves | |||||
| Fagaceae | Quercus robur | Leaves | |||||
| Oleaceae | Fraxinus excelsior | Leaves | |||||
| Betulaceae | Corylus avellana | Leaves | |||||
| Ericaceae | Erica erigena | Stems and leaves | |||||
| Fabaceae | Acacia holosericea | ||||||
| Acacia salicina | |||||||
| Cupressaceae | Callitris endlicheri | ||||||
| Casuarina cunninghamiana | |||||||
| Lauraceae | Neolitsea dealbata | ||||||
| Haemonchus contortus | In vivo | Asteraceae | Artemisia absinthium | Whole plant | Aqueous and methanolic extracts | 4.3–67.2% reduction in EPG |
[86] |
| Haemonchus contortus | In vitro | Asteraceae | Artemisia absinthium | Aerial parts | Crude aqueous extracts | Worm motility inhibition was 73.6% | [87] |
| Crude ethanolic extracts | Worm motility inhibition was 94.7% | ||||||
| Haemonchus contortus | In vivo | Anacardiaceae | Pistacia lentiscus | Leaves | Acetone extracts | Significant decreases in egg excretion | [88] |
| Fagaceae | Quercus coccifera | ||||||
| Onobrychis viciifolia | |||||||
| Ceratonia siliqua | |||||||
| Medicago sativa | |||||||
| Haemonchus contortus eggs | In vitro | Combretaceae | Terminalia glaucescens | Leaves | Methanolic extracts | 87.55% inhibition of egg hatching at the 100 µg/mL dose | [89] |
| Haemonchus contortus eggs | In vitro | Lamiaceae | Leucas martinicensis | Stems and bark | Crude aqueous and hydroalcoholic extracts | Complete inhibition of egg hatching at the 1 mg/mL dose | [90] |
| Leonotis ocymifolia | Aerial parts | ||||||
| Fabaceae | Senna occidentalis | Leaves | |||||
| Polygonaceae | Rumex abyssinicus | Stems and bark | |||||
| Leguminosae | Albizia schimperiana | ||||||
| Haemonchus contortus eggs and larvae | In vitro | Fabaceae | Acacia farnesiana | Dried pods | Hydroalcoholic extracts | 100% ovicidal and 75.2% larvicidal activity at the 50 mg/mL dose | [91] |
| Haemonchus contortus eggs and larvae | In vitro | Fabaceae | Senegalia gaumeri | Leaves | Methanolic extracts | Ovicidal effect in the morula stage | [92] |
| Haemonchus spp. | In vitro | Casuarinaceae | Allocasuarina torulosa | Fresh leaves | Methanolic extracts | 64.14–89.83% exposure at the 30 mg/mL concentration | [93] |
| Fabaceae | Acacia holosericea | ||||||
| Acacia salicina | |||||||
| Cupressaceae | Callitris endlicheri | ||||||
| Casuarinaceae | Casuarina cunninghamiana | ||||||
| Lauraceae | Neolitsea dealbata | ||||||
| Onchocerca gutturosa | In vitro | Annonaceae | Polyalthia suaveolens | Bark | Hexane extracts | Significant inhibitory effect on the vitality of adult male worms | [94] |
| Euphorbiaceae | Discoglypremna caloneura | ||||||
| Onchocerca ochengi | In vitro | Salicaceae | Homalium africanum | Leaves | Hexane methylene chloride extracts | Significant effect | [95] |
| Parascaris equorum | In vitro | Asteraceae | Artemisia dracunculus | Leaves | Methanolic extracts | 90% inhibition of egg hatching and high larvicidal effect at concentrations ≥100 mg/mL | [96] |
| Myrtaceae | Eucalyptus camadulensis | Leaves | |||||
| Lamiaceae | Mentha pulegium | Aerial parts | |||||
| Lamiaceae | Zataria multiflora | Aerial parts | |||||
| Liliaceae | Allium sativum | Bulbs | |||||
| Pheretima posthuma | In vitro | Nyctaginaceae | Bougainvillea spectabilis | Crude extract of flowers | Ethanolic and aqueous extracts |
39 min (time of death) at a concentration of 50 mg/mL | [97] |
| Pheretima posthuma | In vitro | Acanthaceae | Barleria buxifolia | Leaves | Ethanolic extract | 89.00 ± 1.82 min for death time at a concentration of 100 mg/mL | [98] |
| Pheretima posthuma | In vitro | Plumbaginaceae | Plumbago zeylanica | Leaves | Methanolic Extract | 81 ± 1.5 min death time (concentration of 20 mg/mL) | [99] |
| Water Extract | 228 ± 1.2 min death time (concentration of 20 mg/mL | ||||||
| Strongyloides venezuelensis | In vitro | Siparunaceae | Siparuna guianensis | Leaves | Hexane extracts | Significant inhibitory effect on the vitality of adult male worms | [100] |
| Toxocara vitulorum | In vitro | Zygophyllaceae | Balanites aegyptiaca | Fruits | Methanolic extract | 120 μg/ml after 24 h complete disruption of the muscle cells | [101] |
| Teladorsagia circumcincta L1 larvae | In vivo | Fabaceae | Phaseolus vulgaris | Seeds | Lectin purification | Worm burden 4416 ± 878 (control) 3475 ± 792 (treated) |
[102] |
| Trichostrongylus colubriformis L1 larvae | Worm burden 6708 ± 414 (control) 6500 ± 295.5 (treated) |
||||||
| Trichostrongylus colubriformis | In vivo | Moraceae | Artocarpus integrifolia | Whole plant | Ethanolic extracts | Reduced concentration of nematode eggs (2.3 mg semi-purified PHA lectin/kg LW/day) | [102] |
| Fabaceae | Canavalia ensiformis | ||||||
| Fabaceae | Phaseolus vulgaris | ||||||
| Fabaceae | Maackia murensis | ||||||
| Fabaceae | Robinia pseudoacacia | ||||||
| Moraceae | Maclura pomifera | ||||||
| Fabaceae | Dolichos biflorus | ||||||
| Poaceae | Triticum vulgare | ||||||
| Amaryllidaceae | Galanthus nivalis | ||||||
| Rosaceae | Rosa multiflora |
* LC50: Lethal concentration. ** EC50: Effective concentration.
2. Chemical Compounds
The literature review revealed that active chemical compounds present in plants were determined using plant volatile essential oils or extracts in ethanol, butanol, methylene chloride, methanol, hydroalcoholic solvents, dichloromethane, chloroform, petroleum ether, or n-hexane. The following active compounds and secondary metabolites were reported: glycosides, tetrahydroharmine, tannins, gallocatechin, epigallocatechin monomers, jacalin, phytohemagglutinin E2L2, phytohemagglutinin L4, phytohemagglutinin E3L, kidney bean albumin, Maclura pomifera agglutinin, Robinia pseudoacacia agglutinin, wheat germ agglutinin, cysteine proteinases, ursolic acid, galactolipid 2 and 3, aporphines, hexylresorcinol, Dolichos biflorus agglutinin, Galanthus nivalis agglutinin, polycarpol, 3-O-acetyl aleuritolic acid, jacalin (jackfruit agglutinin), concanavalin A (jack bean lectin), Maackia amurensis lectin, dichloromethane, and plumbagin (Table 3).
Table 3.
Candidate natural substances with anthelmintic effects.
| Compound | Parasite Species | Study Model | Reported Mortality | Reference |
|---|---|---|---|---|
| A penta-substituted pyridine alkaloid | Schistosoma mansoni | In vitro | 100% | [103] |
| Essential oil | Echinococcus granulosus (protoscolex) | In vitro | 79.22% scolicidal activity with the 20 mg/mL dose during 60 min | [104] |
| Essential oil (Thymoquinone) | Echinococcus granulosus (protoscolex) | In vitro | 100% scolicidal activity with the 1 mg/mL dose after 10 min | [12] |
| Essential oil | Haemonchus contortus | In vitro and in vivo | 33.3% and 87.5% inhibition motility for flower essential oil | [105] |
| 29.1% and 75% for leaf essential oil | ||||
| 87.2% | ||||
| Lectin purification | Teladorsagia circumcincta (L1) | In vivo | Worm burden 4416 ± 878 (control) 3475 ± 792 (treated) |
[102] |
| Trichostrongylus colubriformis (L1) | Worm burden 6708 ± 414 (control) 6500 ± 295.5 (treated) |
|||
| Tannin | Cooperia spp. | In vivo | Higher activity | [106] |
| Cysteine proteinases (CP) | Hymenolepis diminuta | In vitro | CP extracts exhibited anthelmintic activity in vitro | [107] |
| Pristimerin | Anticestodal | Invitro In vivo |
EPG by 94 ± 5%, 8 ± 4%, 6 ± 3%, and 97 ± 4%, respectively | [60] |
| Ursolic acid | Brugia malayi | Invitro In vivo |
86% inhibition | [108] |
| Withaferin A | Brugia malayi | In vivo | 4.3% reduced parasite load using 8 μg/mL within 24 h | [109,110] |
| Galactolipid-1 Galactolipid-2 Galactolipid-3 Galactolipid-4 |
Brugia malayi | In vitro In vivo |
Fraction F1: 80%; Fraction F2: 30%; Fraction F3: 40%; Fraction F4: 100% (31.25 μg/mL) |
[111] |
| Curcumin | Schistosoma mansoni | In vitro | 100% mortality in male and female | [112] |
| Aporphine |
Anisakis simplex and Hymenolepis nana |
In vitro | No cestocidal and nematocidal effects against H. nana and A. simplex | [113] |
| Derived saponins | Donkey Gastrointestinal Nematodes | In vitro | Significant (p < 0.05) inhibition of nematode egg hatching (>80%) | [114] |
| Maclura pomifera agglutinin | Teladorsagia circumcincta | In vivo | Direct anthelmintic effect on nematode fecundity and an indirect effect by enhancing local immune responses in the host | [102] |
| Tannins | Teladorsagia circumcincta, Haemonchus contortus, and Trichostrongylus colubriformis | In vitro | Larval migration inhibition assay on third-stage larvae (L3) and adult worm motility inhibition assay |
[85] |
| Essential oil | Gastrointestinal nematodes | In vitro | 33.30% inhibition motility | [105] |
| 87.50% inhibition motility | ||||
| Saponins | Gastrointestinal nematodes | In vitro | Strong anthelmintic activity | [115] |
| Donkey strongyles | In vitro | Strong anthelmintic activity | [116] | |
| Tannins | Trichostrongylus colubriformis | In vitro | Larval migration inhibition assay on third-stage larvae (L3) and adult worms | [85] |
| Condensed and hydrolyzable tannins | Caenorhabditis elegans | In vitro | Killed 50% (LC50) or 90% (LC90) of nematodes in 24 h | [57] |
| Tannins | Trichostrongylus colubriformis | In vitro | Larval migration inhibition assay on third-stage larvae (L3) and adult worms | [85] |
| Flavonoids, condensed tannins, and gallotannin | Caenorhabditis elegans | In vitro | Minimum lethal concentration was 0.13–0.52 mg/mL | [117] |
| Methylene chloride | Caenorhabditis elegans | In vitro | Strongest effect | [40] |
| Tannins, phenolic compounds, and steroids | Haemonchus contortus | In vitro, In vivo |
100% inhibition of egg hatching, highest activity for adult motility, and larvicidal assay | [118] |
| Antimicrobial agents, alkaloids, flavonoids, tannins, and phenols | Haemonchus contortus | In vitro | High activity for adulticidal and egg hatching inhibition | [119] |
| Polyphenols | Caenorhabditis elegans | In vitro and in vivo | Inhibition of larval migration | [120] |
| Phenolic compounds | Gastrointestinal nematodes | In vitro In vivo |
Highest nematode motility (100%) in the higher concentrations of methanolic extract (50 mg/mL) | [60] |
| Presence of saponin, alkaloids, flavonoids, and tannins | Haemonchus contortus | In vitro | High mortality rate | [121] |
| Presence of eugenol and asarone | Moniezia expansa | In vitro | 100 mg/mL concentration and the time taken for the paralysis of the parasite amounts to 66.3 ± 0.03 min and death was recorded after 93.2 ± 0.09 min | [122] |
| Proanthocyanidins and flavonoids | Haemonchus contortus | In vitro | Larval migration inhibition and adult worms’ motility inhibition | [123] |
| Essential oils | Neoechinorhynchus buttnerae, endoparasite of Colossoma macropomum | In vitro | All essential oils showed 100% anthelmintic efficacy within 24 h | [124] |
| 100% mortality was observed in the group treated with 100 mg/mL of herbal complex | Haemonchus contortus | In vitro | Anthelmintic potential | [125] |
3. Effect of Plant Extracts in Drug-Resistant Helminths
Medicinal plant extracts have long been used against helminth parasites in humans and livestock; however, scientific support for their application and research on the characterization of active composites remains limited [123]. Numerous studies have investigated anthelmintic resistance, especially in small ruminants. Most studies have used the fecal egg count reduction test (FECRT), which is based on field management practices. Nevertheless, in vivo experiments on drug efficacy have been conducted in areas with high economic importance. Notably, sheep have been studied more extensively than other livestock species, and a broad spectrum of therapeutics have already been developed for sheep [126].
Molecular methods are promising strategies for in vivo and in vitro diagnosis of many infections and may prove to be effective in the detection of parasitic nematodes and anthelmintic resistance [127,128,129,130]. Gaining knowledge about the mechanisms of resistance will ultimately help to reduce anthelmintic drug resistance in parasites. The diagnosis of drug resistance associated with genomic changes using molecular techniques would help in avoiding unnecessary treatments and thus reduce health complications. However, the use of natural plant compounds has the potential to be a complementary control option that can reduce dependence on drug therapy and delay the development of resistance [127,129,131].
In general, many plant secondary metabolites including chalcones, coumarins, terpenoids, tannins, alkaloids, antioxidants, and flavonoids [132,133] possess anthelmintic and neurotoxic properties [134] and inhibit mitochondrial oxidative phosphorylation [135,136]. These plant-based compounds typically show higher biological activity than synthetic compounds [137]. In many parts of the world, plants have been used for many generations and are still being used to treat parasitic diseases [138]. The identification of novel compounds from plants as anthelmintics is an emerging field of research. According to a study, between 2000 and 2019, 40 patents were granted for natural-product-based nematicides divided into seven structural classes [139], but none of them have yet been commercialized. However, difficulties in determining the mechanism of action of the main active ingredients in plant extracts are among the main barriers for researchers.
4. Advantages and Disadvantages of Using Plants for Helminth Parasite Control
Limited information is available on gastrointestinal helminth infections in livestock, which remain a major constraint to livestock production worldwide. Nevertheless, a recent study suggests that anthelmintic plants can be used as a potential resource to improve livestock production [38]. The use of plants as anthelmintics has certain benefits over contemporary veterinary treatments, including affordability, lack of adverse effects, and easy accessibility.
Although most of the information available about the antiparasitic properties of medicinal plants is oral and lacked scientific validity until recently, there is now a growing number of controlled laboratory experiments aiming to confirm and quantify anthelmintic plant activity [24]. Plants can be used in the following two manners: 1. plant parts can be used to cure infected animals naturally or 2. plant extracts and concoctions can be tested both in vitro and in vivo for their anthelmintic potential. The advantages of using antiparasitic plants include effectiveness against species resistant to synthetic anthelmintic drugs, limited or no risk of resistance development, and environmentally friendly procedure [42]. A major drawback is that, to date, only a small number of anthelmintic compounds such as macrocyclic lactones, cyclic octadepsipeptides, benzimidazoles, and imidazothiazoles have been identified in plants after decades of research [65]. Another drawback is the inconsistency between in vitro and in vivo studies on the use of plants as anthelmintics, raising questions regarding their validity and reliability [67]. Additionally, neurological effects associated with the dosage and bioavailability of some medicinal plants need to be elucidated before their use. The choice of an appropriate host–parasite system is tricky in in vivo studies because caring for the animal models adequately is expensive, time-consuming, and labor-intensive [100]. Other drawbacks include uncertainty about plant efficacy, nonspecific responses, irreproducible preparations, and potential negative consequences. An alternative strategy is to use plant secondary metabolites with anthelmintic activity [73]. Secondary metabolites exhibit various modes of action for anthelmintic activity. For example, tannins hinder the feeding process of parasites through forming complexes with parasite proteins or deactivating key enzymes [73]. Terpenes block the tyramine receptors of parasites, whereas alkaloids create unfavorable conditions in the host intestine by generating nitrated and free sugars [97,124]. However, it is important to conduct more studies on the underlying molecular mechanisms and adverse effects on the host to improve drug development.
5. Recommendations
An ideal anthelmintic agent should have a broad spectrum of action, a high treatment rate with a single therapeutic dose, low toxicity to the host, and cost-effectiveness. Most currently used synthetic drugs do not meet these requirements. Commonly used drugs have side effects such as nausea, drowsiness, and intestinal disorders. The development of resistance to existing drugs in parasites and the high cost of drugs have led researchers to explore novel anthelmintic effective agents. Ethnobotanical drugs are the source of easily available and effective anthelmintic agents for humans, especially in tropical and developing countries. Thus, people use various herbs or products derived from plants to treat helminth infections. Plants produce secondary metabolites with various ecophysiological functions, such as defense against pathogen attacks and protection against abiotic stresses. These metabolites have potential medicinal effects in humans and animals.
6. Conclusions and Future Perspectives
It is estimated that more than 2.5 billion people are affected with helminth parasites at some stage in their lives. Parasitic diseases remain the major reason of substantial economic loss owing to their impact on livestock health and unexpected deworming costs. According to the literature review, potential anthelmintic plants exhibit great diversity in terms of species and compounds. Nevertheless, initially, all anthelmintics are tested in livestock before being used for human therapy; thus, developments in veterinary anthelmintics could also lead to advancements in human therapy. In addition, studies on nutritional support and vaccination are also required to develop livestock with low parasite susceptibility.
Author Contributions
Conceptualization and design, S.S., J.C. and H.A.; analysis and interpretation of data, H.K.K., H.A., F.C., S.G.K. and K.S.A.; writing—original draft preparation, H.A., M.S.A. and W.S.; statistical analysis, S.F.; supervision, S.S. and J.C.; writing—review and editing, H.A., M.S.A., K.S.A., S.F., S.S., J.Z., F.P., S.L. and J.C. All authors approved the final version of the manuscript.
Institutional Review Board Statement
Not applicable.
Informed Consent Statement
Not applicable.
Data Availability Statement
Not applicable.
Conflicts of Interest
The authors declare no conflict of interest.
Funding Statement
This study was supported by the National Natural Science Foundation of China (Nos. 81971969, 82272369, and 81772225 to JC) and the Three-Year Public Health Action Plan (2020–2022) of Shanghai (No. GWV-10.1-XK13 to JC). The funders had no role in the study design, the data collection, and analysis, the decision to publish, or the preparation of the manuscript.
Footnotes
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