Results: From four identified species,
Blatella germanica were the most common in all of the wards (88.8%) and next was the Periplaneta
Americana (8%). 20 bacteria species isolated from cockroaches' surface and 21 from digestive
organ. Escherichia coli were the most predominant bacteria isolated from external surface (26.5 %)
as well as alimentary tract (30.8%). The frequency of investigated bacteria on cockroaches' body
surface was not significantly different between Periplaneta Americana and Blattella germanica
except for Kllebsiella oxytoca (P<0.001) and Providensia Spp (P=0.035). Also, frequency of detected
bacteria in cockroaches' digestive organ was not significantly different between these two
species. Furthermore, the frequency of bacteria isolated from the cockroaches' external surface
was not significantly different from that of digestive organ except for shigella disantery (P<0.001),
Pseudomonas aeroginosa (P<0.001) and Klebsiella oxytoca (P=0.013).
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