Activity levels are based on the percent of outpatient visits in a state due to influenza-like illness (ILI) and are compared with the average percent of ILI visits that occur during weeks with little or no influenza virus circulation.

Activity levels are based on the percent of outpatient visits in a state due to influenza-like illness (ILI) and are compared with the average percent of ILI visits that occur during weeks with little or no influenza virus circulation.
Activity levels are based on the percent of outpatient visits in a state due to influenza-like illness (ILI) and are compared with the average percent of ILI visits that occur during weeks with little or no influenza virus circulation.

Credit: CDC

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From the article: Flu Season Is Shaping Up To Be A Nasty One, CDC Says

Activity levels are based on the percent of outpatient visits in a state due to influenza-like illness (ILI) and are compared with the average percent of ILI visits that occur during weeks with little or no influenza virus circulation.

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