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Article: Update: influenza activity--United States and worldwide, May-October 2004.
- Article from:
- MMWR. Morbidity and Mortality Weekly Report
- Article date:
- October 29, 2004
- Author:
CopyrightCOPYRIGHT 2004 U.S. Government Printing Office. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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During May-October 2004, influenza A (H3N2) viruses circulated worldwide and were associated with mild-to-moderate levels of disease activity. Influenza A (H1N1) * and B viruses were reported less frequently. In North America, isolates of influenza A (H3N2), A (H1N1), and B were identified sporadically. This report summarizes influenza activity in the United States and worldwide during May-October 2004 [dagger]. Influenza activity in North America typically peaks during December-March (1).
United States
Until recently, in the United States, national influenza surveillance was conducted by four systems that operated during October-May. One of these ...