Volume 8, Issue 6
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645



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

  • 1.  Feces and meconium of flies reared with a single species of human pathogen or with a multiple saprophytic flora;
  • 2.  Cumulative sampling of feces from flies maintained aseptically for 2 days;
  • 3.  Testing of digestive tract;
  • 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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