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In this article, Sawyer and Lloyd reported that they had developed a reliable technique for testing human exposure to yellow fever, using mice instead of rhesus monkeys. This made it economically possible to do testing on large populations to determine whether yellow fever had been present in a given area within the present generation, and to estimate the time and extent of the infection.
Periodical. Sawyer, Wilbur A., and Wray Lloyd. "The Use of Mice in Tests of Immunity against Yellow Fever." Journal of Experimental Medicine 54, (1931): 533-555. Article. 23 Images.. Journal of Experimental Medicine