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Update: influenza activity--worldwide, 1995

    MMWR. Morbidity and Mortality Weekly Report
    |September 8, 1995
    PubMed

    Insights

    Global influenza activity from March to August 1995 showed low to moderate levels, with co-circulating influenza A and B viruses. Influenza A(H3N2) predominated, though A(H1N1) increased, becoming most frequent in Australia.

    Area of Science:

    • Virology
    • Epidemiology
    • Public Health

    Background:

    • Influenza viruses, including types A and B, cause seasonal epidemics globally.
    • Influenza A subtypes, such as H1N1 and H3N2, exhibit varying prevalence and geographic distribution.
    • Monitoring global influenza activity is crucial for public health preparedness.

    Purpose of the Study:

    • To summarize global influenza activity from March through August 1995.
    • To identify the predominant influenza virus types and subtypes circulating worldwide during the specified period.
    • To document specific trends, such as the increased isolation of influenza A(H1N1) in Australia.

    Main Methods:

    • Surveillance data from global influenza centers were collected and analyzed.
    • Virus isolation and characterization were performed.
    • Reporting focused on the period from March to August 1995.

    Main Results:

    • Low to moderate influenza activity was observed globally during the reporting period.
    • Influenza types A and B viruses were co-circulating.
    • Influenza A(H3N2) was the predominant subtype overall.
    • Influenza A(H1N1) isolations increased, becoming the most frequent isolate in Australia between March and August 1995.

    Conclusions:

    • The 1995 influenza season was characterized by mixed activity of influenza A and B viruses.
    • The increasing prevalence of influenza A(H1N1) warrants continued monitoring.
    • Global surveillance provides essential data for understanding influenza dynamics.

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