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Update: Influenza Activity -- United States

Influenza isolates reported to CDC this season have increased from a cumulative total of 276 last month (1) to 707 (Figure 1). Most virus isolates (93%) have been identified as type A(H3N2) related to the A/Bangkok/79 component of the current vaccine, and 5% have been identified as type A(H1N1) related to the A/Brazil/78 component.

Influenza virus isolates have now been reported from 41 states. Forty states have reported influenza type A(H3N2) virus, and 15, including Kentucky, which recently reported its first influenza isolate for this season, have reported type A(H1N1) virus. Six states have reported influenza type B virus (10 isolates).

For the week ending March 4, five states (Iowa, Kentucky, Nebraska, Ohio, and Virginia) reported widespread influenza activity, and 11 states reported regional influenza activity. For the same week, an excess in the ratio of pneumonia and influenza (P&I) deaths to total deaths was reported from 121 cities for the 8th consecutive week (Figure 1). The ratio was 5.1, and the expected ratio was 4.2. During the last season the P&I ratio was significantly elevated--1980/81--the observed ratio rose more abruptly and peaked near 7.0. Reported by Respective state epidemiologists and laboratory directors; Div of Surveillance and Epidemiologic Studies, Epidemiology Program Office, WHO Collaborating Center for Influenza, Influenza Br, Div of Viral Diseases, Center for Infectious Diseases, CDC.

References

  1. CDC. Update: influenza activity--United States. MMWR 1983;32:75-6.

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