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The Geographical Distribution of Immunity to Yellow Fever among the Primates of Brazil¹

1. A survey of natural immunity to yellow fever among the primates of Brazil has been going on for the past 15 years, more than 5,800 sera have been examined in all.

2. Sixty-five per cent were obtained from monkeys and 35 per cent from marmosets.

3. Immune primates have been found almost everywhere except in the seven states of the northeast, no extensive surveys having yet been carried out in that region.

4. The wide extent of specific immunity among primates captured in nature confirms the fact that jungle yellow fever has prevailed throughout most of Brazil during the past decade and a half.

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 22, N. Y.