**Author details**

Jerry O. Ugwuanyi\* and Augustina N. Okpara Department of Microbiology, University of Nigeria, Nsukka, Nigeria

\*Address all correspondence to: jerry.ugwuanyi@unn.edu.ng

© 2019 The Author(s). Licensee IntechOpen. This chapter is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/ by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
