1University of Wisconsin-Madison, Madison, Wisconsin 53726, Tel. (909) 820-3326.
2Aklilu Lemma Institute of Pathobiology, Addis Ababa University, Addis Ababa, Ethiopia,
P. O. Box 1176, Tel. +251112763091.
3Department of Biology, Howard University, 415 College Street N.W., Washington D.C. 20059,Tel. (202) 806-6950.
Email: [email protected], [email protected]