Table 3.
Checklist of clinical signs of besnoitiosis in ungulates from sub-Saharan Africa between 1960 and 2021.
Country | Species | Host | Breed | No. of animals | Diagnostic test | Sex | Clinical signs observed | Reference |
---|---|---|---|---|---|---|---|---|
Rwanda | B. besnoiti | Cattle | Friesian | 1 | Histopathology& clinical examination | Female | - Hard scaly corrugated skin affecting both sides of the neck. - Multiple pinpoint grayish white foci in the sclera conjunctiva and corneal opacity of the left eye. |
Habarugira et al., 2019 |
Zimbabwe | B. besnoiti | Cattle | – | 5 | Clinical examination | Females | - Dyspnea “magwiriri” (vernacular for snoring or labored breathing), followed by appearance of skin nodules. - Skin developed extensive thickening, puckering, and wrinkling, giving an “elephant skin” appearance with time. - Cyst-like structures in the sclera, and palpebral conjunctiva of some animals with lesions in the vulva. |
Chatikobo et al., 2013 |
South Africa | B. besnoiti | Cattle | Bos taurus | 1 | Necropsy, histopathology, PCR | Male | - Gross external lesions included thin body condition, unilateral epistaxis, conjunctival edema, diffuse subcutaneous edema of ventral head and neck, and areas of dry, cracked, hard skin, in some places sloughing-off to expose underlying irregular erosions or ulcers affected the ventral sternum and trunk, the limbs from the elbow and stifle joints distally, and the entire scrotum | Dubey et al., 2013 |
Kenya | B. caprae | Goats | – | 10 | Histopathology, necropsy & clinical examination | Female & male | - Bucks had acute orchitis, characterised by swollen testes, would not allow palpation. - Fever of 41.8 °C. - Bucks afflicted with subacute and chronic orchitis had atrophied testes that were firm on palpation, and normal body temperature. - Chronically affected does and bucks had alopecia and hyperkeratosis of the face and the carpal, metacarpal, tarsal and metatarsal joints, and cysts in the conjunctiva. |
Njenga et al., 1999b |
Kenya | B. besnoiti | Cattle | Orma Boran | 17 | Histopathology & clinical examination | – | - Animals had sand-like cysts on the sclero-conjunctiva - There was mucus membrane on the nasal cavity - Mucus catarrhal to oozing conjunctivitis with crusts of dried exudates that attracted flies - The skin was thick and nodular, non-elastic and thrown in fold and some sections were alopecic - Generalized lymphadenomegaly of the superficial lymph nodes - Large and benign swellings exuding pus were occasionally encountered on the skin. |
Njagi et al., 1998 |
South Africa | B. bennetti | Horse | Shetland pony stallion | 1 | Histopathology & clinical examination | Male | - Bilateral purulent nasal discharge with severe stridor nasalis and laryngealitis - Inspiratory dyspnoea - Occurrence of generalized thickening and diffuse alopecia of the skin over the ventral abdomen, antero-medial aspect of the hind legs, sub-cervical and presternal areas and the scrotum. - Development of prominent folds of thickened skin between the front legs and on the anteromedial aspects of the hind legs - Enlarged and oedematous prepuce - Anarsaca. |
Van Heerden et al., 1993 |
Nigeria | B. besnoiti | Cattle | Freisian | 2 | Histopathology & clinical examination | Male | - Anorexia and fever - Thickening and wrinkling of the skin around the neck, eyes, muzzles, and abdominal regions. - Alopecia. - Inflammation, thickening and wrinkling of the scrotum. - The lesions on the skin and scrotum deteriorated progressively and became generalized in spite of treatment. |
Sekoni et al., 1992 |
Nigeria | B. besnoiti | Cattle | Friesian | 1 | Histopathology& clinical examination | Male | - Infected bull had alopecia, severely thickened and wrinkled skin, often thrown into folds around the neck, shoulder and rump regions. - The skin was very thick, with small seed-like lumps of various sizes lying deep in the subcutaneous fascia when palpated. - The scrotum and the eyes were involved, with whitish miliary cysts in the conjunctiva. |
Sannusi, 1991 |
Nigeria | B. besnoiti | Cattle | – | 60 | Histopathology & clinical examination | Male & females | - Gross lesions in the skin in 60 affected animals and scrotal skin of 36 bulls showed varying degrees of alopecia, thickening and encrustations. - All of the bulls which were examined at post-mortem had small diffuse nodules underneath the skin in the subcutaneous tissues, in the tunica vaginalis and albuginea and in the parenchyma of the testes and epididymis. - Nodules, consisted of aggregates of small, somewhat white, gritty granules, were also felt underlying the subcutaneous tissues of the clinically affected animals. - The devitalized gangrenous testes were brown in colour and soft in consistency. |
Kumi-Diaka et al., 1981 |
Sudan | B. besnoiti | Cattle | Western Baggara | 1 | Histopathology& clinical examination | Male | - The ox had lesions in the form of alopecia, underlying subcutaneous tissue and muscles. - Observed nodules averaged 5 mm in diameter and each consisted of an aggregate of smaller, but somewhat uniform, raised, whitish nodules ranging between 0.5 mm and 0.7 mm in size. |
Hussein and Haroun, 1975 |
Kenya | B. bennetti | Horse | – | 3 | Pathological examination | Male | - All geldings were emaciated and weak - Horses had alopecia in some areas, and hyperkeratosis measuring between 2 and 6 cm in diameter. - Lesions were spread all over the body but were very severe in the legs, shoulders and head. - In areas where the adjacent lesions coalesced, the foci were much larger in size and had an irregular shape. - Haemorrhagic erosions and ulcers covering the skin from the coronets to both joints - Haemorrhagic bed sores were at point of both ilium bones - The prepuce was swollen by oedema fluid and resembled a tumorous growth. |
Bwangamoi, 1972 |
South Africa | B. besnoiti | Cattle | Afrikander | 5 | Clinical examination | Female & males | - Severe illness accompanied by fever and swelling of the prepuce, i.e. symptoms of the acute anasarcatous stage of besnoitiosis. - Severe sclerodermatitis and alopecia. - Presence of cysts in the scleral conjunctiva - The bull became sterile |
Bigalke and Schoeman, 1967 |