Tanya is principal veterinary res. officer and Technical Adviser no. 1 to the Minister of Scientific Res. and Innovation in Yaoundé, Cameroon. He obtained his DVM (Univ. of Ibadan), Nigeria, MSc (Univ. of Edinburgh) and PhD (Univ. of Florida). His research team demonstrated that the macrofilarial parasite Onchocerca ochengi, closely related to O. volvulus which causes River Blindness in humans, is killed by oxytetracycline acting through the symbiotic organism Wolbachia. This paved the way for antibiotic therapy in cattle, as well as a model for the human infection. With others, he has shown that in a bovine model of onchocerciasis, protective immunity exists naturally, is absent in drug-cured hosts, and is induced by vaccination. He is: member, Cameroon Biosciences Soc.; fellow and treasurer, Cameroon Acad. of Sciences; and winner, 1991 Phi Zeta Award for excellence in vector biology.