In 1934, Dr. Sawyer made another trip to Brazil to inspect yellow fever control activities, including an investigation of a puzzling outbreak of the disease in a rural region. The Yellow Fever Service was run collaboratively by the Rockefeller Foundation and the Brazilian government. Among other activities, the Yellow Fever Laboratories performed mouse protection tests on blood samples (to track where the disease had been active) and examined samples of liver tissue taken from fatal yellow fever cases to confirm the diagnosis.
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