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SARS-CoV-2 in influenza positive cases in Wuhan, China. Number of influenza and SARS-CoV-2 cases were sampled between 4 January 2019 and 19 January 2020. The vertical columns scaled on the left y axis report the monthly or daily influenza and SARS-CoV-2 case numbers and the color blocks in the columns represent the single infection or co-infection.
