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Background  The mechanical transmission of pathogenic bacteria by synanthropic filth flies is widely recognized. While many studies report the fate and the temporospatial distribution of ingested foodborne bacteria by filth flies, there is little evidence about the transmission dynamics of ingested foodborne bacteria by adult house flies ( Musca domestica ) to their progeny. In this study, we fed parental house fly adults with food contaminated with low, medium, and high concentrations of  Salmonella enterica ,  Cronobacter sakazakii ,  Escherichia coli  O157:H7 ,  and  Listeria monocytogenes  and evaluated the probability of transmission of these pathogens to house fly eggs and the surface and the alimentary canal of their first filial (F 1 ) generation adults.    Results  All foodborne pathogens were present in samples containing pooled house fly eggs. The probability of transmission was higher after parental house flies ingested food containing medium bacterial loads.  Cronobacter sakazakii  was 16, 6, and 3 times more likely to be transmitted to house fly eggs than  S. enterica ,  E. coli  O157:H7, and  L. monocytogenes , respectively. Only  S. enterica  and  C. sakazakii  were transmitted to F 1  generation adults and their presence was 2.4 times more likely on their body surfaces than in their alimentary canals. The highest probabilities of finding  S. enterica  (60 %) and  C. sakazakii  (28 %) on newly emerged F 1  adults were observed after parental house flies ingested food containing medium and high levels of these pathogens, respectively.    Conclusion  Our study demonstrates that adult house flies that fed from food contaminated with various levels of foodborne bacteria were able to transmit those pathogens to their eggs and some were further transmitted to newly emerged F 1  generation adults, enhancing the vector potential of these insects. Understanding the type of associations that synanthropic filth flies establish with foodborne pathogens will help to elucidate transmission mechanisms and possible ways to mitigate the spread of foodborne pathogens.    Electronic supplementary material  The online version of this article (doi:10.1186/s12866-015-0478-5) contains supplementary material, which is available to authorized users.

bmc microbiology

Ingested Salmonella enterica, Cronobacter sakazakii, Escherichia coli O157:H7, and Listeria monocytogenes: transmission dynamics from adult house flies to their eggs and first filial (F1) generation adults