G. KALINER,^* J. G. GROOTENHUIS,^** D. PROTZ<sup>***


*</sup>Veterinary Research Laboratory, P.O. Kabete, Kenya.
^**Wildlife Disease Research Project, Veterinary Research Laboratory, P.O. Kabete, Kenya, a project of the Government of Kenya supported by the United Nations Development Progromme with the Food and Agricultural Organization of the United Nations as the Executing Agency.
^***Veterinary Investigation Centre, P.O. Box 3084, Arusha Tanzania.