Dr. Sawyer was in West Africa from December 1926 to mid-June 1927, serving as director of the West African Yellow Fever Commission while Dr. Henry Beeuwkes was on leave. In this letter, he told Mrs. Sawyer about his daily routine, working arrangements, the work being done to culture the leptospira bacteria (then believed to be the likely causative organism of yellow fever), and the rather relaxed social functions he attended.
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