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JAMA. 2002;287:35-37.

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

MMWR. 2001;50:1084-1086

In collaboration with the World Health Organization (WHO) and its collaborating laboratories, National Respiratory and Enteric Virus Surveillance System (NREVSS) collaborating laboratories, state and local health departments, and a network of sentinel physicians, CDC conducts surveillance to monitor influenza activity and to detect antigenic changes in circulating strains of influenza viruses. This report summarizes influenza activity in the United States*¹ during September 30–November 24, 2001, when the viruses isolated most frequently were influenza A (H3N2). These viruses were well matched antigenically by the 2001-02 influenza A (H3N2) vaccine. Vaccine supplies are plentiful and influenza vaccine should continue to be offered during December and later.

As of November 24, WHO and NREVSS collaborating laboratories in the United States tested 8,140 specimens for influenza viruses; 73 (0.9%) were positive. The percentage of positive influenza isolates identified each week is an indicator of the level of influenza activity, and for the . . . [Full Text of this Article]