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JAMA. 2002;287:2068-2069.

	Since this article does not have an abstract, we have provided the first 150 words of the full text and any section headings.

MMWR. 2002;51:276-279

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Although data collected from the four components of the CDC influenza surveillance system* are preliminary, national influenza activity appears to have peaked during the week ending February 23, 2002 (week 8). During the 2000-01 and 1999-2000 influenza seasons, peak activity occurred during week 4 and week 51, respectively. The viruses most commonly isolated during the 2001-02 season have been influenza A (H3N2). These viruses were well-matched antigenically by the 2001-02 influenza A (H3N2) strain in the vaccine. This report summarizes influenza activity in the United States during September 30, 2001–March 23, 2002, and updates previous summaries from this season.^1,2

For the weeks ending January 26 (week (4) through March 23 (week 12), the period covered since the last report, the percentage of respiratory specimens testing positive for influenza viruses, a key indicator of the level of influenza activity, ranged from 17.6% (week (4) to 25.9% . . . [Full Text of this Article]