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During an epidemic wave of yellow fever, which entered the western part of the State of Minas Gerais in 1935, virus spread throughout the numerous small discontinuous forest patches which characterize this area. These forest patches are uninhabited by humans but have a permanent population of cebus monkeys. Evidence is presented which indicates that the virus probably persisted in these isolated forests only for a short time after the cessation of human infections. There is no evidence that virus is active in this area at the present time.
1 The studies and observations on which this paper is based were conducted with the support and under the auspices of the Yellow Fever Research Service (Serviço de Estudos e Pesquisas sôbre a Febre Amarela) of the Ministry of Education and Health of Brazil in cooperation with the International Health Division of The Rockefeller Foundation.
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