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  • Title: Update: influenza activity--United States and worldwide, May-September 2003.
    Author: Centers for Disease Control and Prevention (CDC).
    Journal: MMWR Morb Mortal Wkly Rep; 2003 Sep 26; 52(38):911-3. PubMed ID: 14508440.
    Abstract:
    During May-September 2003, influenza A(H3N2) viruses circulated worldwide and were associated with mild to moderate levels of disease activity. Influenza A(H1) and B viruses were reported less frequently. In North America, isolates of influenza A(H3N2), A(H1), and B were identified sporadically. This report summarizes influenza activity in the United States and worldwide during May-September 2003. Influenza activity in North America typically peaks during December-March, which underscores the need to begin vaccinating against influenza in October and to continue vaccination into December and throughout the influenza season.
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