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Weekly Report: Influenza Summary Update

Week ending October 5, 2002-Week 40

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The following information may be quoted:

Synopsis:

During week 40 (September 29 - October 5, 2002)*, none of the specimens tested by World Health Organization (WHO) and National Respiratory and Enteric Virus Surveillance System (NREVSS) laboratories were positive for influenza. The proportion of patient visits to sentinel providers for influenza-like illness (ILI) overall was 1.1%, which is less than the national baseline of 1.9%. The proportion of deaths attributed to pneumonia and influenza was 5.6%. Five state and territorial health departments reported sporadic influenza activity and 38 reported no influenza activity**.

Laboratory Surveillance*:

During week 40, WHO and NREVSS laboratories reported 508 specimens tested for influenza viruses. No influenza isolates were identified.

During September 1-28, 2002, one influenza A(H3N2) virus and one unsubtyped influenza A virus were reported from Hawaii and Louisiana, respectively. Influenza B viruses were reported from Hawaii (1 isolate) and Tennessee (2 isolates).

Pneumonia and Influenza (P&I) Mortality Surveillance:

During week 40, the percentage of all deaths due to pneumonia and influenza as reported by the vital statistics offices of 122 U.S. cities was 5.6%. This percentage is below the epidemic threshold of 6.4% for week 40.

Pneumonia And Influenza Mortality

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Influenza-like Illness Surveillance *:

During week 40, 1.1% of patient visits to U.S. sentinel providers were due to ILI. On a regional level***, the percentage of visits for ILI ranged from 0.1% to 1.8%. Due to wide variability in regional level data, it is not appropriate to apply the national baseline to regional level data.

Influenza Activity as Assessed by State and Territorial Epidemiologists**:

Influenza activity was reported as sporadic in 5 states (Colorado, Georgia, Hawaii, North Carolina, and West Virginia). Thirty-nine states and New York City reported no influenza activity and 6 states and Washington, D.C. did not report.

Usmap for Weekly Influenza Activity


* Reporting is incomplete for this week. Numbers may change as more reports are received.

** Influenza activity is defined as influenza-like illness and/or culture-confirmed influenza.

*** Surveillance Regions: New England (Connecticut, Maine, Massachusetts, New Hampshire, Vermont, Rhode Island); Mid-Atlantic (New Jersey, New York City, Pennsylvania, Upstate New York); East North Central (Illinois, Indiana, Michigan, Ohio, Wisconsin); West North Central (Iowa, Kansas, Minnesota, Missouri, Nebraska, North Dakota, South Dakota); South Atlantic (Delaware, Florida, Georgia, Maryland, North Carolina, South Carolina, Virginia, Washington, D.C., West Virginia); East South Central (Alabama, Kentucky, Mississippi, Tennessee); West South Central (Arkansas, Louisiana, Oklahoma, Texas); Mountain (Arizona, Colorado, Idaho, Montana, Nevada, New Mexico, Utah, Wyoming); Pacific (Alaska, California, Hawaii, Oregon, Washington)

Report prepared October 10, 2002

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