Persistence of Bacteria in the Developmental Stages of the Housefly

IV. Infectivity of the Newly Emerged Adult

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  • University of Illinois, College of Pharmacy, Chicago 12, Illinois

Summary

An evaluation of the infectivity of the newly emerged adult housefly is based on a quantitative bacteriological study of the following:

  1. 1.Feces and meconium of flies reared with a single species of human pathogen or with a multiple saprophytic flora;
  2. 2.Cumulative sampling of feces from flies maintained aseptically for 2 days;
  3. 3.Testing of digestive tract;
  4. 4.Sampling of bacteria on the surface and within the fly.

Data for the first three categories indicate that the fly's gut contains very few bacteria. This is further evidence for a general process of gut sterilization which commences before pupation and is completed by the time of eclosion. The data for the fourth category show that surface contaminants account for only a part of the remaining flora, the rest of which is retained internally at counts of about 100. The epidemiological implications of these findings are discussed.

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