As Director of Laboratories at the Rockefeller Foundation's International Health Division, Dr. Sawyer served as a delegate to various international health conferences. Returning from a conference on yellow fever in Cape Town in November 1932, he passed through the Belgian Congo (now Zaire) to talk with officials there about yellow fever surveys. He then spent several days visiting staff at the RF yellow fever laboratory in Nigeria. The caption on the back of the photograph reads, "Jan 20, 1933. Lagos, Nigeria. Cottage in which W.A.S, stayed in 1926-27."
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