Authors: Olaniyi M. O., Oyekunle, M. A., Ajayi, O. L., Omotainse, S. O., Sonibare, A. O., Talabi, A. O. and Alaka, O. O
Bulletin of Animal Health and Production in Africa, Vol. 60 (2: pp 119-125.
Abstract
An acute severe fibrinonecrotic bronchopneumonia suggestive of Mannheimia haemolytica infection was diagnosed histopathologically in West African Dwarf (WAD) sheep submitted to the Veterinary Teaching Hospital (VTH), University of Agriculture, Abeokuta, Nigeria. Mannheimia spp was isolated from the nasal swab and lymph node and lung samples of the affected sheep. The isolated organism was found to have cultural, morphological and biochemical properties consistent with those of Mannheimia haemolytica biotype A. The organism was resistance to ampicilin, streptomycin, gentamcycin, oxytetracyclin and trimethoprim in agar disc diffusion method. It was however sensitive to furazolidone, ciprofloxacin and norfloxacin. The present finding is consistent with the view that M. haemolytica may occur in a proportion of small ruminants that exhibit respiratory problem. It is therefore suggested that in the present natural outbreak, climatic condition, environmental and/or transportation stress could have resulted in the break down of the defense barrier of the sheep resulting in eventual susceptibility to infection by Mannheimia haemolytica.