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U.S. Influenza Activity Update -- Week Ending April 22, 2000

Flu Map
Color Key

Summary:

Influenza activity was reported as sporadic in 10 states. Thirty-six states reported no influenza activity and 4 states did not report. No state reported regional or widespread activity.

Source: U.S. Centers for Disease Control and Prevention Influenza Activity Surveillance based on weekly reports from state and territorial health departments.


Activity levels:

  • Sporadic - Sporadically occurring cases of influenza-like illness or culture-confirmed influenza, with no outbreaks detected.

  • Regional - Outbreaks of influenza-like illness or culture-confirmed influenza in a county or counties having a combined population of less than 50% of the state's total population.

  • Widespread - Outbreaks of influenza-like illness or culture-confirmed influenza in a county or counties having a combined population comprising 50% or more of the state's total population.

For more detailed information on flu activity in the United States, check the CDC's weekly Influenza Summary Update.

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