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Influenza activity--United States and worldwide, 2007-08 season

    MMWR. Morbidity and Mortality Weekly Report
    |June 28, 2008
    PubMed

    Insights

    The 2007-08 influenza season saw increased child hospitalizations and mortality in the US. Influenza A (H1N1) and A (H3N2) were the main strains, with varied global prevalence.

    Area of Science:

    • Epidemiology
    • Virology
    • Public Health

    Background:

    • The 2007-08 influenza season exhibited elevated activity in the United States, surpassing the previous three seasons.
    • This season was characterized by increased mortality and higher hospitalization rates among children aged 0-4 years.

    Purpose of the Study:

    • To summarize and analyze influenza activity in the United States and globally during the 2007-08 season.
    • To identify the predominant influenza strains and their geographical distribution.

    Main Methods:

    • Surveillance data from the 2007-08 influenza season (September 30, 2007-May 17, 2008) were collected.
    • Influenza virus strains (A (H1N1), A (H3N2), and B) were identified and their circulation patterns analyzed.

    Main Results:

    • Influenza activity peaked in mid-February in the US, with significant increases in child mortality and hospitalizations.
    • Influenza A (H1N1) was initially dominant, followed by Influenza A (H3N2) which predominated overall in the US.
    • Globally, Influenza A (H1N1) was prevalent in North America, Europe, and Africa, while Influenza B predominated in Asia.

    Conclusions:

    • The 2007-08 influenza season posed a significant public health burden, particularly for young children in the US.
    • Strain surveillance and understanding geographical variations are crucial for effective influenza management and response.

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