Institution: | (1) Present address: c/o Lessing Kolleg Marbacher, Weg 18, 3550 Marburg L, West Germany;(2) Present address: Faculty of Veterinary Science, University of Khartoum, PO Box 32, Khartoum North, Sudan;(3) Department of Mycoplasma, Veterinary Research Administration, PO Box 8067, El Amarat, Khartoum, Sudan |