As Director of Laboratories at the Rockefeller Foundation's International Health Division, Dr. Sawyer made inspection tours of yellow fever and malaria control laboratories in South America and Africa. During May and June of 1930, he visited RF operations in Brazil. (His baggage included 200 live white mice for the labs so they could use the recently developed mouse protection test for yellow fever immunity.) In Bahia he spent time conferring with Dr. Fred Soper and staff. The caption on the back of the photograph reads, "Dr. Soper at the wall near an old fort, Bahia, Brazil. June 15, 1930."
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