Monkeys in relation to yellow fever in Bwamba County, Uganda

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Abstract
Evidence is offered to show that yellow fever is endemic among the monkey population of Bwamba County, Uganda. Aedes africanus, a night feeding arboreal mosquito, is the suspected vector. Monkeys in the uninhabited tsetse fly portion of the area are just as heavily infected as they are anywhere in the forest area, and may therefore serve as hosts from which the disease may spread to those monkeys in closer association with man and exposed to A. simpsoni, the normal man-to-man vector of the region. Immunity is developed in about 61% of all of the lowland monkeys. Upland monkeys show no such immunity and probably never have come in contact with the disease in their natural habitat. Offspring of immune mothers show a passive congenitally acquired immunity which lasts up to about 6 months after birth.

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