Abstract
West Nile Virus (WNV) is a zoonotic mosquito borne arbovirus that causes encephalitis in horses and human. It is a pathogen of public health importance globally. Data on WNV epizootics in Nigeria is limited, necessitating seroprevalence studies in animals. In this study, 118 sera from Polo horses and 66 archival sera from 31 horses, 10 chicken, 15 rabbits and 10 dogs in Northern and South-Western Nigeria were screened for WNV using West Nile multi-species competitive ELISA. The overall seroprevalence of WNV was 78.26% (n=144). In horses, 93.28% (n=139) of the 149 horse sera were positive, all the 10 chicken samples tested were negative to WNV, only 1 (6.67%) of the 15 rabbits sera tested positive and 4(40%) of 10 dog sera tested was positive. The lack of sero-reactivity in domestic chickens in this study does not suggest a low incidence rate in wild birds that are known reservoirs. Sero-reactivity in rabbits and dogs indicates their exposure and susceptibility to WNV and therefore requires further investigation. The high sero-reactivity recorded in horses reiterates the important role they play in WNV epizootics which underscores the public health risk associated with WNV at the human-animal interface in Nigeria.
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