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. 2023 May 25;17(5):e13151. doi: 10.1111/irv.13151

FIGURE 1.

FIGURE 1

Number of persons tested for influenza A at University Health Services and percent influenza A positivity, by date of influenza test (N = 3268 tested)—University of Michigan, Ann Arbor, Michigan, USA, October 6–November 23, 2021. University Health Services does not conduct influenza A testing on Sundays. For persons tested more than once during October 6–November 23, 2021, the first influenza A positive test result was used, or if the individual never tested positive for influenza A, the first negative test was used.