1. Veterinary Research Laboratory, P.O. Box CY 551, Causeway, Harare, Zimbabwe
2. Swiss Rabies Centre, University of Berne, Langgass Strasse 122, CH-3001 Berne, Switzerland
3. Present address: Animal Diseases Research Institute, P.O. Box 11300, Station H, Nepean, Ontario K2H 8P9, Canada
4. Faculty of Veterinary Science, University of Zimbabwe, P.O. Box MP 167, Mount Pleasant, Harare, Zimbabwe
5. Central Veterinary Laboratory, New Haw, Weybridge, Surrey, KT15 3NB, United Kingdom
6. International Laboratory for Research on Animal Diseases, P.O. Box 30709, Nairobi, Kenya