Sarcosaprophagous flies in Suez gvernorate, Egypt IV- persistence of human pathogenic bacteria in the developmental stages

ABSTRACT

The persistence of three species of human pathogenic bacteria [Escherichia coli, Shigella sonnei and Staphylococcus epidermidis] in sterile artificially fed larvae was examined till adult emergence after ingestion by three species of sarcosaprophagous flies [House fly, Musca domestica, Oriental latrine blow fly, Chrysomya megacephala and Australian cheep blow fly, Lucilia cuprina]. The number of bacteria present in mature maggots, pupae and emerging adults declined significantly [P<0.05]. Each human pathogenic bacteria when introduced into a sterilized larval medium, was routinely recovered from larvae [10[5], pupae [ranged from 10[3] to l0[4] and the majority of emerging flies retain 10[2] bacteria, whereas some are sterile. The potentiality of emerged flies to harbor bacteria is clearly different [M. domestica > C. megacephala > L cuprina]. No detection for S. epidermidis from emerged C. megacephala and L. cuprina flies, moreover S. sonnei was not detected in the emerged flies of L cuprina