Volume s1-15, Issue 2
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645



  • 1.  In Jamaica, feed on yaws lesions in enormous numbers.
  • 2.  show a marked preference for feeding on lesions on the lower extremities.
  • 3.  will crawl underneath scabs to feed and thus frequently obtain fresh material containing living .
  • 4.  These flies, if fed on highly infectious lesions, will take in large numbers of spirochaetes, some of which may later be regurgitated in “vomit drops.”
  • 5.  often feed intermittently on different persons or different ulcers.
  • 6.  Male flies feed only on very rare occasions on ulcer material.
  • 7.  caught in an area where there are no infectious cases of yaws do not naturally contain or any other spirochaetes resembling this organism.
  • 8.  the technic of dissecting flies is described.
  • 9.  The majority of the ingested by from framboesia lesions on patients, remain actively motile for about seven hours in the oesophageal diverticulum. In the stomach, however, they loose their motility very rapidly.
  • 10.  The majority of the ingested spirochaetes are found in the oesophageal diverticulum for the first eight hours following the infecting feed, after which time they have passed over into the stomach.
  • 11.  Very few spirochaetes remain in the proboscis of the flies, and those that do lose their motility quickly.


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  • Received : 12 Nov 1934
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