All of the collected cockroaches were used for detection of bacterial contamination. 76.1% of German cockroaches and 75% of American cockroaches had at least one bacteria species on their external surface while all of the P. australasiae and Blatta orientalis had external bacterial infection. Also, 86.5% of Blattella germanica and 95% of Periplaneta Americana had at least one bacteria species on their digestive organ (Table 2).