U. S. Department of Health, Education, and Welfare, Public Health Service, National Institutes of Health, National Institute of Allergy and Infectious Diseases, Rocky Mountain Laboratory, Hamilton, Montana
Transmission of yellow fever virus to rhesus monkeys by and infection of aged Aedes aegypti in Nigerian studies are reported. In closely duplicated tests, infected insects lived as long as normal ones (182 days). Two feedings on immune blood did not “sterilize” infected mosquitoes. Virus was demonstrated in all 3 major body regions as well as in the proboscides in older insects, but not in the heads at only 3 days' incubation. In 2 non-vector species, neither of which caused infection by bites, virus was found only in the abdomens of A. irritans after 51 days, but in all 3 regions of A. punctocostalis after 39 days.