1. Department of Basic Sciences & Aquatic Medicine, Norwegian School of Veterinary Science, PO Box 8146 Dep., N – 0033 Oslo, Norway
2. Ministry of Livestock Development and Fisheries - Veterinary Investigation Centre - Te meke, P.O Box 9254 DarEs-Salaam, Tanzania
3. Department of Production Animal Clinical Science, Norwegian School of Veterin ary Science, PO Box 8146 Dep., N – 0033 Oslo, Norway
4. Department of Veterinary Medicine and Public Health, Faculty of Veterinary Medicine, Sokoine University of Agriculture, PO Box 3021, Morogoro, Tanzania
5. Department of Animal Science and Production, Faculty of Agriculture, Sokoine University of Agriculture, PO Box 3004, Morogoro, Tanzania
6. Norwegian Institute for Nature Research (NINA), Fakkelgården, Storhove, N-2624 Lillehammer, Norway