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back to Cold & Flu report
U.S. Influenza Activity Update -- Week Ending April 22, 2000
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