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JAMA. 2000;284:2712-2714.

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

MMWR. 2000;49:1006-1008

During October 1999–May 2000, influenza A(H3N2), A(H1N1), and B viruses were identified in the Northern Hemisphere. Influenza A(H3N2) predominated, but the number of influenza A(H1N1) viruses increased toward the end of the influenza season in the Northern Hemisphere. Since April, influenza A viruses have predominated in the Southern Hemisphere and tropical regions, but influenza B viruses also have been identified. This report summarizes influenza activity in the United States and worldwide from April 2000 through October 2000.

United States

The WHO Collaborating Center for Reference and Research at CDC conducts active national surveillance for influenza from October through May.¹ Although formal weekly reporting is discontinued during summer months, WHO collaborating laboratories can report influenza viruses during the summer to CDC and submit these viruses for antigenic characterization. Since March, influenza A(H1N1) viruses have been the most frequently isolated influenza viruses in the United States. Influenza A(H1N1) viruses were . . . [Full Text of this Article]

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