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The Susceptibility of Howler Monkeys to Yellow Fever Virus¹

1. Two species of Brazilian howler monkeys were found to be highly susceptible to the Olímpio Cristo strain of yellow fever virus when transmitted by mosquito bite.

2. Four cyclic transmissions were obtained with A. scapularis and three with A. leucocelaenus.

3. The facility with which laboratory transmissions were obtained with A. scapularis suggests a possible explanation for the survival of virus in the winter months in south Brazil.

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, which was maintained jointly by the Ministry of Education and Health of Brazil and by the International Health Division of The Rockefeller Foundation.

² Field Staff Members, International Health Division, Rockefeller Foundation, 49 West 49th St., New York 20, N. Y.