Figure 2. Flu increasing except in Midwest.

Virus from infections shed into municipal wastewater is shown as the average of daily samples (in millions) taken for the week ending on the date indicated.

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US, West, and Northeast virus levels for week ending October 26 based on 3-, 3-, and 5-day averages, respectively.

Chart: Henry A. Choy, COVID and Vaccine UpdateSource: Derived with WastewaterSCAN dataCreated with Datawrapper