[1] Makerere Univ, Coll Vet Med, Anim Resources & Biosecur COVAB, POB 7062, Kampala, Uganda
[2] Univ Goettingen, Div Microbiol & Anim Hyg, D-37077 Gottingen, Germany
[3] Univ Khartoum, Inst Studies & Promot Anim Exports, Unit Anim Hlth & Safety Anim Prod, Shambat 13314, Khartoum North, Sudan
[4] Alneelain Univ, Fac Med, Ibn Sina Specialised Hosp Khartoum, Khartoum 11112, Sudan
[5] Univ Med Ctr Goettingen, Dept Gastroenterol & Gastrointestinal Oncol, D-37075 Gottingen, Germany
[6] Univ Eldoret, Sch Agr & Biotechnol, Dept Anim Sci & Management, POB 1125-30100, Eldoret, Kenya
[7] Univ Leipzig, Inst Anim Hyg & Vet Publ Hlth, D-04103 Leipzig, Germany