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. 2023 May 11;12(5):698. doi: 10.3390/pathogens12050698

Key Aspects of Coronavirus Avian Infectious Bronchitis Virus

Jing Zhao 1,2, Ye Zhao 2, Guozhong Zhang 1,2,*
Editor: Cristiano Salata
PMCID: PMC10221305  PMID: 37242368

Abstract

Infectious bronchitis virus (IBV) is an enveloped and positive-sense single-stranded RNA virus. IBV was the first coronavirus to be discovered and predominantly causes respiratory disease in commercial poultry worldwide. This review summarizes several important aspects of IBV, including epidemiology, genetic diversity, antigenic diversity, and multiple system disease caused by IBV as well as vaccination and antiviral strategies. Understanding these areas will provide insight into the mechanism of pathogenicity and immunoprotection of IBV and may improve prevention and control strategies for the disease.

Keywords: coronavirus, avian infectious bronchitis virus, evolution, genetic diversity, antigenic diversity, vaccination

1. Increasing Threats of Coronaviruses

Coronaviruses (CoVs) are enveloped, positive-sense, single-stranded RNA viruses belonging to the family Coronaviridae within the order Nidovirales and are widespread pathogens of significant potential threat to animals and humans [1,2,3]. The Coronaviridae are divided into alpha-, beta-, delta-, and gammacoronavirus genera (Table 1) and can infect a range of hosts, including humans, pigs, chickens, cows, horses, dogs, cats, turkeys, ducks, and many wild animals [1,4,5].

Table 1.

Classification of coronaviruses by the International Committee on Taxonomy of Viruses, and the major virus species belonging to the Coronaviridae family that threaten poultry and other livestock and pets or humans.

Order/Suborder Family/Subfamily Genus/Subgenus Notable Virus Species Main Host
Nidovirales
Cornidovirineae 		Coronaviridae
Orthocoronavirinae 		Alphacoronavirus
Duvinacovirus Human coronavirus 229E (HCoV-229E) Human
Pedacovirus Porcine epidemic diarrhea virus (PEDV) Pig
Rhinacovirus Swine acute diarrhea syndrome coronavirus (SADS-CoV) Pig
Setracovirus Human coronavirus NL63 (HCoV-NL63) Human
Alphacoronavirus 1
Transmissible gastroenteritis virus (TGEV) Pig
Feline infectious peritonitis virus (FIPV) Cat
Canine coronavirus (CCoV) Dog
Betacoronavirus
Embecovirus Betacoronavirus 1
Human coronavirus OC43 (HCoV-OC43) Human
Bovine coronavirus (BCoV) Cow
Equine coronavirus (ECoV) Horse
Human coronavirus HKU1 (HCoV-HKU1) Human
Merbecovirus Middle East respiratory syndrome-related coronavirus (MERS-CoV) Human
Sarbecovirus Severe acute respiratory syndrome-related coronavirus
Severe acute respiratory syndrome-related coronavirus (SARS-CoV) Human
Severe acute respiratory syndrome-related coronavirus 2 (SARS-CoV-2) Human
Deltacoronavirus
Buldecovirus Porcine deltacoronavirus (PDCoV) Pig
Gammacoronavirus
Brangacovirus Goose coronavirus CB17 (GCoV-CB17) Goose
Igacovirus Avian coronavirus
Infectious bronchitis virus (IBV) Chicken
Turkey coronavirus (TCoV) Turkey
Duck coronavirus 2714 (DCoV-2714) Duck
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Among these CoVs, the porcine epidemic diarrhea virus and transmissible gastroenteritis virus of the Alphacoronavirus genus can impose a heavy disease burden on swine. Severe acute respiratory syndrome coronavirus (SARS-CoV), Middle East respiratory syndrome coronavirus (MERS-CoV), and SARS-CoV-2, which belong to the Betacoronavirus genus, have a significant mortality rate in humans. Porcine deltacoronavirus of the Deltacoronavirus genus infects piglets causing diarrhea, vomiting, and dehydration. Infectious bronchitis virus (IBV) of the Gammacoronavirus genus causes a highly contagious respiratory, renal, and genital disease in chickens known as avian infectious bronchitis (IB) [1,2,5,6].

IB is now a predominantly viral disease of commercial poultry worldwide that can affect chickens of all ages and types and has become a significant challenge for the poultry industry globally despite the extensive use of vaccination as a major control measure [7,8,9,10,11]. The major problem is that IBV constantly evolves via mutation and recombination to produce new variants or serotypes, and the protective immunity induced by one IBV serotype has poor cross-protection against infection by other serotypes.

2. Worldwide Distribution of Avian Infectious Bronchitis Virus

IBV was the first coronavirus to be discovered and was isolated from newly hatched chicks in the USA in 1931 [12]. The natural hosts of IBV are chicken, although it has also been isolated from other birds, including ducks, geese, pigeons, pheasants, peafowl, quail, parrots, penguins, and turkeys [8,13,14,15]. As shown in Table 1, IB was described before the 1990s in many countries following the first isolation of IBV. It is evident that IB has become a global disease with a wide distribution around the world [7,8]. Additionally, multiple genotypes or serotypes of IBV strains co-exist in many countries (Table 2) because of the rapid variation and spread and poor cross-protection among different mutants or serotypes.

Table 2.

The first described outbreak and current situation of IB in several countries.

Year a Country Host Coexisting Strains/Genotype b Refs
1931 USA Chicken DMV/1639 (GI-17)
CA1737 (GI-25)
Mass-type (GI-1)		 [12,16,17,18]
1954 Egypt Chicken EGY-var 1, 2 (GI-23)
793B-type (GI-13)		 [19,20]
1954 Japan Chicken JP- I (GI-18)
JP-Ⅱ (GI-7)
JP-Ⅲ (GI-19, QX-type)
JP-Ⅳ (GVI-1)
793B-type (GI-13)
Mass-type (GI-1)		 [21,22,23,24]
1956 Netherlands Chicken D1466 (GⅡ-1)
D181 (GⅡ-2)
QX-type (GI-19)
793B-type (GI-13)		 [25,26,27]
1957 Brazil Chicken Mass-type (GI-1)
SB2805 (GI-23)
GI-11
GI-16		 [28,29]
1960s UK Chicken 793B-type (GI-13)
QX-type (GI-19)
Mass-type (GI-1)		 [8,30]
1962 Australia Chicken N1/62 (GI-5)
Vic S (GI-6)
N18/91 (GⅢ-3)
N1/03 (GⅤ)		 [31,32]
1962 Thailand Chicken QX-type (GI-19)
Mass-type (GI-1)
793B-type (GI-13)
CU-92 (Novel variant)		 [33,34]
1967 New Zealand Chicken N1/62 (GI-5)
Vic S (GI-6)		 [8,35]
1969 Chile Chicken 793B-type (GI-13)
Q1 (GI-16)		 [36,37]
Early 1970s Spain Chicken QX-type (GI-19)
793B-type (GI-13)
Mass-type (GI-1)
Italy 02 (GI-21)
D274 (GI-12)		 [38,39]
1977 Indonesia Chicken QX-type (GI-19)
793B-type (GI-13)
Mass-type (GI-1)		 [40,41]
Early 1980s China Chicken QX-type (GI-19)
Taiwan-I (GI-7)
TC07-2 (GⅥ-1)
793B-type (GI-13)
Mass-type (GI-1)		 [42,43,44]
1984 India Chicken Mass-type (GI-1)
793B-type (GI-13)
Variant IBV(GI-24)		 [45,46]
1986 Korea Chicken QX-type (GI-19)
TC07-2 (GⅥ-1)
D85/06 (GI-15)		 [47,48]
1986 Morocco Chicken Moroccan isolates (GI-21)
793B-type (GI-13)
Mass-type (GI-1)		 [49,50]
1990 Nigeria Chicken Mass-type (GI-1)
793B-type (GI-13)
Q1 (GI-16)
QX-type (GI-19)		 [51,52]
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a Time when the disease was first described. b In parentheses: genotype according to Valastro et al. [53].

In the USA, numerous IBV strains have been isolated since the 1930s, and major lineages belong to GI-9 (ArkDPI-like strains), GI-17 (DMV/1639-like strains), and GI-25 (CA1737-like strains) [12,16,17,18,53]. Currently, GI-17 (DMV/1639-like strains) is the major variant of IBV circulating in US commercial poultry; it was initially isolated in 2011 and began causing significant diseases in 2014/2015 [17]. In Latin America, lineages GI-1, GI-11, GI-16, and GI-23 are coexisting at present in Brazil, and the prevalent genotypes are GI-13 (793B-type) and GI-16 (Q1) in Chile [28,29,37]. In Africa, such as Egypt, Morocco, and Nigeria, the co-epidemic lineages include GI-1 (Mass-type) and GI-13 (793B-type); in addition to this, there are Egyptian IBV variants 1, 2 (GI-23) in Egypt, Moroccan isolates (GI-21) in Morocco, and QX-type (GI-19) strains in Nigeria [20,49,50,51]. In Australia and New Zealand, the co-epidemic lineages include GI-5 (N1/62) and GI-6 (Vic S), which caused mortalities of 40% to 100% between 1961 and 1976. Since 1988, N18/91 (GⅢ-3) and N1/03 (GⅤ) strains have been predominant in Australia, which mainly cause respiratory disease with lower mortality rates [32,53]. In Europe, the most common strains belong to lineages GI-13 (793B-type) and GI-19 (QX-type), followed by Mass-type (GI-1) strains in UK and Spain, D1466-like (GⅡ-1) and D181-like (GⅡ-2) strains in the Netherlands, and Italy 02 (GI-21) and D274 (GI-12) strains in Spain [8,26,27,38,39]. The GI-13 (793B-type) was detected most frequently in Europe, followed by GI-19 (QX-type) and GI-1 (Mass-type). In Asia, including Japan, Korea, India, Indonesia, Thailand, and China, QX-type (GI-19) strains are the most prevalent and exist in all six countries; 793B-type (GI-13) is the second popular lineage that exists in five countries except Korea; Mass-type (GI-1) strains are also isolated in India, Indonesia, Thailand, and China [22,23,24,34,40,41,42,43,44,45,46,48]. In addition, many other strains (lineages) are found in several countries, such as lineage GⅥ-1 (TC07-2) in Korea and China, Variant IBV (GI-24) in India, D85/06 (GI-15) in Korea, Taiwan-I (GI-7) in China, CU-92 (Novel variant) in Thailand, and Gray (GI-3), JP- I (GI-18) and JP-Ⅱ (GI-7) in Japan [8,22,34,44,46,48,53].

Especially in China, IBV was first described and isolated from chickens in the early 1980s. The virus has now spread to all poultry breeding areas. IB ranks first or second among the important infectious diseases of poultry in annual statistics in China and causes significant economic losses. Currently, at least four main IBV lineages, including QX-type (GI-19), Taiwan-I (GI-7), TC07-2 (GⅥ-1), and 793B-type (GI-13) coexist in chicken farms, which considerably increases the difficulty of prevention and control of the disease [11,43,44,54]. Among the four lineages, GI-19 (QX-type) lineage viruses are the most common strains with relatively higher pathogenicity, with a virus isolation rate of over 70%, whereas GⅥ-1 (TC07-2) lineage isolates have begun to significantly increase in prevalence in recent years, but have lower pathogenicity [8,9,43,44].

3. Genetic Diversity of Avian Infectious Bronchitis Virus

High rates of mutation, short generation times, and large population sizes drive the rapid evolution of RNA viruses, and consequently, most of the viral outbreaks over the last 100 years have been caused by RNA viruses [55]. Among the RNA viruses, positive-sense single-stranded RNA (+ssRNA) viruses such as IBV have the highest mutation rates [56,57]. IBV lacks a viral polymerase proofreading mechanism, and genetic mutation and recombination can continuously occur in the genome, especially in hypervariable regions of the S1 glycoprotein, which enables the continuous emergence of variants, genotypes, or serotypes [7,16,58,59].

IBV strains are clustered into six genotypes (GⅠ–GⅥ) using the complete nucleotide sequences of the S1 gene, and together these contain 34 distinct viral lineages and several inter-lineage recombinants [53]. Of these genetic lineages, GⅠ-1, GⅠ-3, GⅠ-5, GⅠ-6, GⅠ-7, GⅠ-9, GⅠ-11, GⅠ-12, GⅠ-13, GⅠ-15, GⅠ-16, GⅠ-17, GⅠ-18, GⅠ-19, GⅠ-21, GⅠ-23, GⅠ-24, GⅠ-25, GⅡ-1, GⅡ-2,GⅢ-3, GⅤ, GⅥ-1, and several variants exist in many countries. The GⅠ-1 (Mass-type), GI-13 (793B-type), and GI-19 (QX-type) lineages are widely distributed in many countries, and especially QX-like viruses are now globally widespread (Figure 1). GI-7 (Taiwan-I) lineage strains have also been mainly isolated in China in recent years. Notably, live-attenuated vaccines of the Mass-type (e.g., strain H120), 793B-type (e.g., strain 4/91), Delmarva-type (e.g., DMV/1639 in the USA), and QX-type (e.g., QXL87 in China) are commonly used in many farms or countries [8,48,60,61,62,63]. Therefore, the possibility that several IBV strains are responsible for the re-isolation of the vaccine viruses cannot be excluded.

Figure 1.

Figure 1

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Phylogenetic trees based on the complete S1 glycoprotein gene of the infectious bronchitis virus (IBV). The tree was generated using the neighbor-joining method in MEGA 7 software package with 1000 bootstrap replications. The IBV genotypes were defined as described by Valastro et al. [53].

A timeline with the date of isolation of each presenting IBV strain and used live-attenuated vaccines in China is shown in Figure 2. Suspected IB was first described in 1972 in Guangdong province, China [64]. Early in the 1980s, Mass-like IBV was isolated from Chinese chicken flocks that were genetically similar to that found in the USA. To control the diseases in chickens, the inactivated and live-attenuated vaccines of Mass (H52 and H120) and Conn serotypes were used. The IBV strains from T-type (GI-5), QX-type (GI-19), TC07-2-type (GⅥ-1), and TW-type (GI-7) were successively isolated from the vaccinated chicken flocks [65,66,67]. Currently, GI-19 (QX-type) and GⅥ-1 (TC07-2-type) lineage strains have become the dominant strains of IBV in China [68,69,70].

Figure 2.

Figure 2

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Chronological timeline showing the emergence and spread of the present IBV strains and introduction of live-attenuated vaccines in China.

4. Antigenic Diversity of Avian Infectious Bronchitis Virus

New IBV variants continuously emerge through genetic recombination and mutation, and several exhibit clear antigenicity differences revealed by cross-neutralization tests or monoclonal antibody analysis. The GI-19 lineage (QX-type) strains, for instance, are prevalent in many parts of the world, and are distinct from all other known IBV strains, indicating that these strains belong to different serotypes [71,72,73]. Antigenic variation of IBV is mainly associated with the spike protein because this is a major inducer of neutralizing antibodies and immunoprotection [7,16,52,69]. Other proteins, including structural or nonstructural proteins and accessory proteins, contribute to and influence antigenic differences [7,59]. Thus, antigenic variation of IBV is caused by various factors.

Currently, IBV exists as a serotype score worldwide, and most of these have poor cross-protection with each other [7,74,75,76,77]. This means that vaccination with a particular serotype of IBV may not provide protection against other serotypes. As a result of the antigenic variation, the disease presents a continuing coexistence of multiple serotyping strains, meaning that the production of new IB vaccines that better match the prevalent virus strains will likely continue for a long time. To address the major challenge of IBV antigenic diversity, researchers have focused on understanding the genetic mechanisms underlying IBV evolution, developing new vaccines with cross-protection, improving biosecurity measures to prevent viral spread, and so on.

5. Multiple System Disease Caused by Avian Infectious Bronchitis Virus

Most IBVs can infect the respiratory, renal, and reproductive systems of chickens. Following the initial infection in the respiratory tract with clinical signs (sneezing, gasping, coughing, tracheal rales, nasal discharge, and dyspnea), IBV is disseminated to other tissues by viremia [75]. One possible mechanism is that some strains could infect blood monocytes, and therefore facilitate the dissemination of IBV to visceral organs [78,79]. IBV dissemination beyond the respiratory tract may involve the lymphatic system and infected macrophages as with several other viruses [80,81]. Compared with other IBV strains, the nephropathogenic strains have received increased attention because of their higher virulence in young birds [42]. The kidneys of nephropathogenic IBV-infected chickens are pale, discolored, and enlarged with obvious urate deposition on post-mortem examination [79,82,83]. IBV infections in young chickens are common between the ages of 1 to 30 days and can cause reproductive tract defects [84,85,86]. The infected chickens develop cystic oviducts, leading to false layer syndrome with distinctly low peak egg production [86,87,88,89]. Infection with IBV in laying hens can negatively influence egg production with poor-quality eggs [90,91,92]. Several IBV strains can infect the nervous system of chickens [93]. These strains contain an extra furin cleavage site upstream of the fusion peptide (S2’ site) enabling them to infect monocytes and neuron cells, thus leading to viremia or encephalitis in chickens [78,93].

Although differences in clinical and pathological outcomes in chickens depend on the infecting IBV strain, many IBV strains can simultaneously infect multiple physiological systems in chickens, which is termed “multiple symptoms with one virus” (Figure 3). First, IBVs can infect the respiratory system of chickens, causing damage to the integrity of the respiratory mucosa, which could increase the susceptibility to secondary viral and bacterial infections [71,94,95,96]. Second, IBVs can infect the renal system, leading to increased mortality [71,82,95,97,98]. Third, IBVs can infect the reproductive system of chickens, reducing egg production with poor shell quality or with false layers [18,85,86,95,99]. Fourth, IBVs can infect the nervous system of chickens, causing significantly increased mortality [78,93]. Studies of IBV and host interactions could help to understand the tropism of IBV in various body systems and act as a model to contribute an invaluable resource for studying other pathogenic CoV diseases.

Figure 3.

Figure 3

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Schematic diagram showing clinical manifestations of IBV infection. Clinical signs and main outcomes are summarized, showing the effects of the virus on different body systems.

6. Prevention and Control of Avian Infectious Bronchitis Virus

In modern poultry farms, an effective management system and biosecurity measures are of primary importance to control infectious diseases. This premise is based entirely on the correct understanding of the factors influencing viral spread, as with the avian influenza virus [100,101,102]. Therefore, a more comprehensive analysis of the epidemiological aspects behind the spread of IBV, especially the spreading determinants, is critical and urgently required [103,104].

Despite drawbacks, including severe reactions to vaccination at the day of age, the likelihood of viral recombination, and frequent vaccine replacement caused by viral mutation, vaccination remains the most effective control measure for IB [105,106,107,108,109]. Efficient and properly performed vaccination may reduce the emergence of clinical signs, infectious pressure, and viral population size [105].

Currently, almost all commercial chicken flocks are vaccinated against IBV. The most effective IB vaccine is the live-attenuated vaccine, and H120 is one of the excellent vaccine strains widely used in the world. The vaccination protocol for IBV can vary depending on the vaccine used and the specific conditions of the poultry operation. In general, chicks are vaccinated at one day old or at hatchery, and then again several times throughout their life to maintain immunity. Booster vaccinations may be given at 7–10 days of age, at 3–4 weeks of age, and then every 5–6 weeks thereafter. Because of the many existing variants worldwide, the concept of protectotype has been increasingly accepted for controlling IB. One of the most commonly applied protectotype vaccination protocols against IB in the EU is the simultaneous or alternate use of Ma5 and 4/91 vaccine strains to provide protection against homologous or heterologous IBV strains [110]. In China, the H120 vaccine combined with an endemic strain, such as QXL87 (QX-like, GI-19), FNO-55 (4/91-like, GI-13), or LDT3-A (YN-like, GI-28), is commonly used to control IB.

Different vaccine platforms have been designed to develop effective vaccines against IBV. However, new vaccine techniques are rarely used because of the relatively complex immune protection mechanism and are currently only in the laboratory research stage [63,111,112,113,114,115,116,117]. Consequently, both inactivated and live-attenuated IBV vaccines are widely available worldwide [118,119,120,121].

7. Concluding Remarks and Future Directions

IB is a highly contagious viral disease caused by coronavirus IBV that produces severe economic losses in the poultry industry worldwide. Despite immunization and biosecurity measures, IB still frequently occurs in commercial chicken flocks because of the constant emergence of new IBV variants as well as poor cross-protection against them with the existing vaccines currently in use. Therefore, similarly to the threat of SARS-CoV-2 to human health, IB continuously threatens the healthy development of the poultry industry.

As with other CoVs, IBV undergoes rapid evolution, producing a growing number of genotypes and serotypes due to high rates of mutation, viral recombination, and host selection pressure. IBVs have a high genetic and antigenic diversity, whereas our knowledge of the ecology and evolution of IBVs remains very limited.

IBV infection can induce obvious respiratory and reproductive symptoms as well as increased mortality in chickens, especially when secondary infections of bacteria or viruses occur. “Multiple symptoms with one virus” caused by IBV affects chickens of various types and ages globally and most likely will continue to be a serious threat to the global poultry industry.

To prevent and control IB, the most effective measure at present remains vaccination despite current challenges. Clarifying the pathogenesis of the virus and optimizing the vaccination strategy using specific local strains will help to address continuing concerns over the efficacy of existing IB vaccines.

Acknowledgments

We thank Mike Herbert for editing the English text of the draft of this manuscript.

Author Contributions

Conceptualization, J.Z. and G.Z.; formal analysis, J.Z. and Y.Z.; software, writing—original draft preparation, J.Z.; visualization, writing—review and editing, Y.Z. and G.Z.; supervision, funding acquisition, G.Z. All authors have read and agreed to the published 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 Key Research and Development Program of China (2021YFD1801103), the National Natural Science Foundation of China (32272986), and the 2115 Talent Development Program of China Agricultural University.

Footnotes

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