Also, twenty one bacteria species were detected from the samples’ digestive organ (Table 3). Furthermore, the body surface of E.coli (30.8%) was the most frequently isolated from cockroaches’ alimentary tract while the least contamination approved to Morganella morganii (0.8%). Frequency of detected bacteria in cockroaches’ digestive organ was not significantly different between Periplaneta Americana and Blattella germanica (Tables 3, Table 4).