Abstract
In order to know the relationship of flies with the food pollution, the quantity of bacteria carried by them was studied fundamentally in the present study and the following results were obtained. The pathogenic bacteria (Shigella dysenteriae, Salmonella typhi murium) which were taken by flies in their larval stage were extinguished in the pupal stage, but the pupal content, harbouring non-pathogenic bacteria, did not become an aseptic state. At ordinary creeping of the adult flies, the transmission of bacteria was mainly the mechanical dissemination by means of adhesion of bacteria to tarsi. The quantity of bacteria attached to the tarsi was proportional to the density of bacteria on the materials on which flies creeped. The maximum value of bacterial transmission was observed when a fly creeped on the materials of which water content was 30 per cent and viscosity was 180.
