The International Journal of Biotechnology 2306-6148 7 1 In Vitro Antibacterial Effects of Chloroform, Methanol and Water Extracts of Croton Macrostachyus Stem Bark Against Escherichia Coli and Staphylococcus Aureus Standard and Clinical Strains 1 7 10.18488/journal.57.2018.71.1.7