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Evidence is presented which indicates that immunity to yellow fever endures for at least 6 years after inoculation with 17D yellow fever vaccine of adequate potency.
1 This Institute is financed by means of grants made by The Rockefeller Foundation and by the Secretary of State for the Colonies under the Colonial Development and Welfare Acts and by contributions from the Governments of Uganda, Kenya, Tanganyika, Northern Rhodesia, Nyasaland and Zanzibar.
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