Y. M. Somorin1* and S. A. Bankole2
1Department of Microbiology, University of Agriculture, Abeokuta, P. O. Box 851, Ota, Ogun State, Nigeria.
2Department of Microbiology, Olabisi Onabanjo University, P. M. B. 2002, Ago-Iwoye, Ogun State, Nigeria.