Weekly Report: Influenza Summary Update
Week ending November 20, 2004-Week 46

The following information may be quoted:

Pneumonia and Influenza (P&I) Mortality Surveillance*:

During week 46, 6.7% of all deaths reported by the vital statistics offices of 122 U.S. cities were reported as due to pneumonia or influenza. This percentage is below the epidemic threshold of 7.2% for week 46.

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Influenza-Associated Pediatric Mortality*:

As of week 46, no influenza-associated pediatric deaths have been reported to CDC.

Influenza-Associated Pediatric Hospitalizations:

The New Vaccine Surveillance Network consists of three sites in Cincinnati OH, Nashville TN, and Rochester NY. The sites conduct population-based surveillance for laboratory-confirmed influenza among children 0–4 years of age who are admitted to the hospital with fever or acute respiratory illnesses. During October 3–November 13, 2004, there were no laboratory-confirmed influenza-associated hospitalizations for children 0–4 years old. In years 2000–2003, the end-of-season hospitalization rate ranged from 3.7 to 12 per 10,000 children. Hospitalization rate estimates are preliminary and may change as data continue to be collected

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The Emerging Infections Program (EIP) is collecting data in 9 sites on hospitalizations of children <18 years of age with illnesses associated with laboratory-confirmed influenza. Hospitalization data from the EIP sites will be included as they become available.

Influenza-like Illness Surveillance*:

During week 46, 1.5%*** of patient visits to U.S. sentinel providers were due to ILI. This percentage is less than the national baseline of 2.5%. On a regional level**, the percentage of visits for ILI ranged from 0.7% in the New England region to 2.5% in the Mid-Atlantic region. The percentage of visits for ILI in the Mid-Atlantic region increased from 1.6% reported last week. Due to wide variability in regional level data, it is not appropriate to apply the national baseline to regional level data.

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Influenza Activity as Assessed by State and Territorial Epidemiologists*:

During week 46, Alaska and Delaware reported widespread activity, and New York and New York City reported regional activity. Thirty-one states (Arizona, California, Colorado, Connecticut, Florida, Georgia, Hawaii, Illinois, Indiana, Kansas, Louisiana, Maryland, Massachusetts, Michigan, Minnesota, Montana, Nebraska, Nevada, New Hampshire, North Carolina, North Dakota, Ohio, Rhode Island, South Carolina, Tennessee, Texas, Utah, Virginia, Washington, West Virginia, and Wisconsin) and the District of Columbia reported sporadic influenza activity. Fourteen states reported no influenza activity and 2 states did not report.

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