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Ideally, the people who observe and record the children’s behavior are unaware of who was assigned to the experimental or control group, in order to control for experimenter bias. Experimenter bias refers to the possibility that a researcher’s expectations might skew the results of the study. Remember, conducting an experiment requires a lot of planning, and the people involved in the research project have a vested interest in supporting their hypotheses. If the observers knew which...
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Mycobacterium ulcerans, the cause of Bairnsdale ulcer, was discovered, cultivated, and transmitted to animals. Insectivorous bats and bed-bugs are speculated as potential natural hosts and vectors, respectively.

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Area of Science:

  • Microbiology
  • Infectious Diseases
  • Zoology

Background:

  • Mycobacterium ulcerans causes the Bairnsdale ulcer, a significant human and animal disease.
  • Understanding the transmission cycle of Mycobacterium ulcerans is crucial for disease control.

Purpose of the Study:

  • To document the discovery, cultivation, and animal transmission of Mycobacterium ulcerans.
  • To investigate potential animal hosts and vectors for Mycobacterium ulcerans.

Main Methods:

  • Detailed record of experimental procedures for isolation and cultivation.
  • Animal inoculation studies to demonstrate infectivity and transmission.
  • Ecological and etiological discussion of potential reservoirs and vectors.

Main Results:

  • Successful isolation, cultivation, and experimental transmission of Mycobacterium ulcerans in animals.
  • Identification of insectivorous bats as potential natural hosts.
  • Identification of bat-associated bugs (e.g., bed-bugs) as potential vectors.

Conclusions:

  • Mycobacterium ulcerans can be cultivated and experimentally transmitted between animals.
  • Bats and associated bugs are plausible natural hosts and vectors, warranting further investigation.