1. Department of Veterinary Anatomy and Physiology University of Nairobi P.O Box 30197‐00100 Nairobi Kenya
2. Department of Experimental Medicine University of Copenhagen Faculty of Health Sciences Blegdamsvej 3B Copenhagen N DK‐2200 Denmark
3. South Eastern Kenya University School of Agriculture and Veterinary Sciences P.O Box 170‐90200 Kitui Kenya