We now know, as the
result of our observations, that in the case of an insect kept at room
temperature during the cool weather of November, fifteen or even
eighteen days would, in all probability, be too short a time to render
it capable of producing the disease.
As bearing upon the source of infection, we invite attention to the
period of time during which the subjects had been kept under rigid
quarantine, prior to successful inoculation, which was as follows: Case
1, fifteen days; Case 3, nine days; Case 4, nineteen days; Case 5,
twenty-one days. We further desire to emphasize the fact that this
epidemic of yellow fever, which affected 33.33 per cent of the nonimmune
residents of Camp Lazear, did not concern the seven nonimmunes occupying
Tents Nos, 1, 4, 6 and 7, _but was strictly limited to those individuals
who had been bitten by contaminated mosquitoes._
Nothing could point more forcibly to the source of this infection than
the order of the occurrence of events at this camp. The precision with
which the infection of the individual followed the bite of the mosquito
left nothing to be desired in order to fulfill the requirements of a
scientific experiment.
In summing up their results at the conclusion of this report the
following statement is made:
Out of a total or eighteen nonimmunes whom we have inoculated with
contaminated mosquitoes, since we began this line of investigation,
eight, or 44.
Pages:
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377