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Persistence of Bacteria in the Developmental Stages of the Housefly
II. Quantitative Study of the Host-Contaminant Relationship in Flies Breeding Under Natural Conditions
Bernard Greenberg
Bernard Greenberg
University of Illinois College of Pharmacy, Chicago, Illinois
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Summary
- 1. Listed are species of bacteria, the so-called normal flora, which successfully survive metamorphosis and can be recovered from emerging adults breeding in the laboratory in CSMA, and under natural conditions in horse manure.
- 2. The number of bacteria present in mature maggots, prepupae, pupae and emerging adults breeding in the laboratory in CSMA and under natural conditions in horse manure, privy contents and in garbage is presented in graphic form. Mature maggots support populations of 107 bacteria. During the prepupal stage, the count falls to 105 and 106. At the commencement of pupation counts generally range from 104 to 105, and this range is maintained during metamorphosis. The majority of emerging flies retain 102 or 103 bacteria, whereas some are sterile and others have 106. Thus two declines consistently appear in the survival pattern: in the prepupa and the newly emerged adult.
- 3. Single-species infection with Shigella or Salmonella, dual infection and infection with a multiple saprophytic flora exhibit a pattern of bacterial survival which is essentially similar in all cases. On the basis of the evidence presented in this and the preceding study, it is considered doubtful that the normal flora are better suited than the pathogens for survival in the gut of the developing fly.
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| Past two years | Past Year | Past 30 Days | |
|---|---|---|---|
| Abstract Views | 415 | 140 | 8 |
| Full Text Views | 12 | 1 | 1 |
| PDF Downloads | 11 | 0 | 0 |