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Update: Influenza activity--United States, 2001-02 season
Abstract:
Although influenza activity in the United States remained low from October through mid-January, the number and percentage of specimens testing positive for influenza viruses have increased in recent weeks. Laboratory-confirmed influenza infections have been reported from 45 states. The predominant influenza viruses isolated this season have been type A (H3N2) viruses that are well matched by this season's influenza vaccine. This report summarizes U.S. influenza activity from September 30, 2001 through January 19, 2002 and updates the previous summary.
Insights
Influenza activity in the US increased in January 2002, with type A (H3N2) viruses predominating. These viruses are well-matched by the current influenza vaccine, offering protection against widespread illness.
Area of Science:
- Public Health
- Virology
- Epidemiology
Background:
- Influenza activity in the United States was low from October to mid-January.
- Recent weeks have seen an increase in positive influenza virus specimens.
Purpose of the Study:
- To summarize U.S. influenza activity from September 30, 2001, to January 19, 2002.
- To update the previous summary of influenza surveillance data.
Main Methods:
- Monitoring of laboratory-confirmed influenza infections across states.
- Isolation and characterization of predominant influenza virus strains.
Main Results:
- Laboratory-confirmed influenza infections reported from 45 states.
- Predominant viruses identified as influenza A (H3N2).
- Circulating influenza A (H3N2) viruses are well-matched by the current season's vaccine.
Conclusions:
- Influenza activity has recently increased in the U.S.
- The current influenza vaccine is expected to be effective against the predominant H3N2 strains.