Volume s1-26, Issue 3
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645



Yellow fever virus was isolated from caught in 1942 in a forestedge plantation in Western Uganda 11 months after the effective mass immunization of the human population.

The virus was again isolated in 1944 from a lot of 80 mosquitoes, including 12 different species but not including or . These mosquitoes were taken in the uninhabited Semliki Forest, indicating an extrahuman cycle of virus activity involving a forest vector.

The implications of the results are discussed with reference to the epidemiology of the disease in forest regions and the means by which the infection reaches man.


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