[1] Fed Univ Wukari, Dept Anim Prod & Hlth, Wukari, Taraba, Nigeria
[2] Ahmadu Bello Univ, Vet Publ Hlth & Prevent Med, Zaria, Nigeria
[3] Univ Jos, Dept Vet Publ Hlth & Prevent Med, Plateau, Nigeria
[4] Univ Nottingham, Sch Life Sci, Virus Res Grp, Queens Med Ctr, Nottingham, England
[5] Univ Maiduguri, Dept Vet Parasitol & Microbiol, Borno, Nigeria
[6] Ahmadu Bello Univ, Dept Vet Publ Hlth & Prevent Med, Zaria, Nigeria