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    Example Results Estimated Influenza Burden

    Country:
    XXXXXXX
    Influenza season:
    XXXX

    Disease Severity Pyramid

    95% Confidence Interval (CI): X,XXX to X,XXX Deaths
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    This is an estimate of influenza-associated deaths. If you added an expansion factor for deaths, this number includes both in-and out-of hospital deaths. If you did not add an expansion factor for deaths, this number only represents deaths occurring inside of a hospital.

    : X,XXX
    95% CI: X,XXX to X,XXX Critically Ill (ICU-level) Hospitalized Cases
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    This is an estimate of influenza-associated cases that are hospitalized and are severe enough to require intensive care. Often these cases are termed as “critically ill” and may receive care in an intensive care unit (ICU) if available. These are a proportion of all hospitalized cases.

    : X,XXX
    95% CI: X,XXX to X,XXX Non-critical Hospitalized Cases
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    This is an estimate of influenza-associated cases that are hospitalized, but are not so severe that they are deemed to be critically ill or are treated in an intensive care unit.

    : X,XXX
    95% CI: X,XXX to X,XXX Medically Attended Mild/Moderate Cases
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    This is an estimate of influenza-associated mild/moderate cases that are attended by healthcare providers in an outpatient setting.

    : X,XXX
    95% CI: X,XXX to X,XXX Non-Medically-Attended Mild/Moderate Cases
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    This is an estimate of influenza-associated mild/moderate cases that do not seek medical care for their illness.

    : X,XXX

    Summary of Estimated Influenza Burden

    Total Per 100k population
    Deaths(95% Confidence Interval) X,XXX(X,XXX to X,XXX) X,XXX(X,XXX to X,XXX)
    Hospitalized Cases(95% CI) X,XXX(X,XXX to X,XXX) X,XXX(X,XXX to X,XXX)
    Mild/Moderate Cases(95% CI) X,XXX(X,XXX to X,XXX) X,XXX(X,XXX to X,XXX)
    Case Fatality Risk (CFR) X.XX%

    Estimated Influenza Cases and Deaths by Age Group and Pyramid Level

    All ages 0–4 years 5–14 years 15–49 years 50–64 years 65 and over
    Deaths(95% Confidence Interval) X,XXX(X,XXX to X,XXX) X,XXX(X,XXX to X,XXX) X,XXX(X,XXX to X,XXX) X,XXX(X,XXX to X,XXX) X,XXX(X,XXX to X,XXX) X,XXX(X,XXX to X,XXX)
    Hospitalized Cases(95% CI) X,XXX(X,XXX to X,XXX) X,XXX(X,XXX to X,XXX) X,XXX(X,XXX to X,XXX) X,XXX(X,XXX to X,XXX) X,XXX(X,XXX to X,XXX) X,XXX(X,XXX to X,XXX)
    Critical ICU Cases(95% CI) X,XXX(X,XXX to X,XXX) X,XXX(X,XXX to X,XXX) X,XXX(X,XXX to X,XXX) X,XXX(X,XXX to X,XXX) X,XXX(X,XXX to X,XXX) X,XXX(X,XXX to X,XXX)
    Non-Critical ICU Cases(95% CI) X,XXX(X,XXX to X,XXX) X,XXX(X,XXX to X,XXX) X,XXX(X,XXX to X,XXX) X,XXX(X,XXX to X,XXX) X,XXX(X,XXX to X,XXX) X,XXX(X,XXX to X,XXX)
    Mild/Moderate Cases(95% CI) X,XXX(X,XXX to X,XXX) X,XXX(X,XXX to X,XXX) X,XXX(X,XXX to X,XXX) X,XXX(X,XXX to X,XXX) X,XXX(X,XXX to X,XXX) X,XXX(X,XXX to X,XXX)
    Medically-Attended Cases(95% CI) X,XXX(X,XXX to X,XXX) X,XXX(X,XXX to X,XXX) X,XXX(X,XXX to X,XXX) X,XXX(X,XXX to X,XXX) X,XXX(X,XXX to X,XXX) X,XXX(X,XXX to X,XXX)
    Non-Medically-Attended Cases(95% CI) X,XXX(X,XXX to X,XXX) X,XXX(X,XXX to X,XXX) X,XXX(X,XXX to X,XXX) X,XXX(X,XXX to X,XXX) X,XXX(X,XXX to X,XXX) X,XXX(X,XXX to X,XXX)

    Average (mean) estimated Influenza Cases and Deaths Per 100k Population by Age Group and Pyramid Level

    All ages 0–4 years 5–14 years 15–49 years 50–64 years 65 and over
    Deaths per 100k Population(95% Confidence Interval) X,XXX(X,XXX to X,XXX) X,XXX(X,XXX to X,XXX) X,XXX(X,XXX to X,XXX) X,XXX(X,XXX to X,XXX) X,XXX(X,XXX to X,XXX) X,XXX(X,XXX to X,XXX)
    Hospitalized Cases per 100k(95% CI) X,XXX(X,XXX to X,XXX) X,XXX(X,XXX to X,XXX) X,XXX(X,XXX to X,XXX) X,XXX(X,XXX to X,XXX) X,XXX(X,XXX to X,XXX) X,XXX(X,XXX to X,XXX)
    Critical ICU Cases per 100k(95% CI) X,XXX(X,XXX to X,XXX) X,XXX(X,XXX to X,XXX) X,XXX(X,XXX to X,XXX) X,XXX(X,XXX to X,XXX) X,XXX(X,XXX to X,XXX) X,XXX(X,XXX to X,XXX)
    Non-Critical ICU Cases per 100k(95% CI) X,XXX(X,XXX to X,XXX) X,XXX(X,XXX to X,XXX) X,XXX(X,XXX to X,XXX) X,XXX(X,XXX to X,XXX) X,XXX(X,XXX to X,XXX) X,XXX(X,XXX to X,XXX)
    Mild/Moderate Cases per 100k(95% CI) X,XXX(X,XXX to X,XXX) X,XXX(X,XXX to X,XXX) X,XXX(X,XXX to X,XXX) X,XXX(X,XXX to X,XXX) X,XXX(X,XXX to X,XXX) X,XXX(X,XXX to X,XXX)
    Medically-Attended Cases per 100k(95% CI) X,XXX(X,XXX to X,XXX) X,XXX(X,XXX to X,XXX) X,XXX(X,XXX to X,XXX) X,XXX(X,XXX to X,XXX) X,XXX(X,XXX to X,XXX) X,XXX(X,XXX to X,XXX)
    Non-Medically-Attended Cases per 100k(95% CI) X,XXX(X,XXX to X,XXX) X,XXX(X,XXX to X,XXX) X,XXX(X,XXX to X,XXX) X,XXX(X,XXX to X,XXX) X,XXX(X,XXX to X,XXX) X,XXX(X,XXX to X,XXX)

    Estimated Influenza Hospitalized Cases by Syndrome

    # of Hospitalizations % of all Hospitalizations
    Respiratory Hospitalizations(95% Confidence Interval) X,XXX(X,XXX to X,XXX) X.XX%
    Circulatory Hospitalizations(95% CI) X,XXX(X,XXX to X,XXX) X.XX%
    Other Non-respiratory, Non-circulatory Hospitalizations(95% CI) X,XXX(X,XXX to X,XXX) X.XX%

    Understanding your results

    The Flu Tool aims to help public health leaders, policymakers, and researchers estimate seasonal influenza burden at the national level or in specific sub-populations. These estimates can inform decision-making about influenza-related interventions (e.g., disease surveillance programmes, vaccination campaigns, antiviral treatments) and associated resource allocations, based on the defined populations’ needs.

    How to interpret your results

    The Flu Tool provides one approach to estimating burden of disease and provides one potential input into the decision-making process for resource allocation and public health interventions. These estimates are based on limited data as well as multipliers and other assumptions that introduce additional uncertainty. The tool calculates confidence intervals (CI) to convey the degree of precision and uncertainty associated with burden estimates. It is important to note, however, that while this tool provides evidence-based estimates for influenza morbidity and mortality, it is not a replacement for influenza surveillance and testing. The results are not definitive answers regarding seasonal influenza burden of disease, and the Flu Tool does not predict the burden for future influenza seasons.

    Using your results

    The results of this tool can be used for many purposes, including:

    • Estimating the magnitude of influenza-associated mild/moderate cases, hospitalizations, critical cases, and deaths in specific populations
    • Observing how seasonal influenza burden may differ by age group across a specific population
    • Comparing the estimated burden of seasonal influenza to other diseases and public health problems
    • Serving as a key data point in national- or sub-national-level policy and program discussions about reducing seasonal influenza burden
    • Exploring the effects of disease severity and surveillance data quality on seasonal influenza burden

    Further resources

    The WHO Manual for estimating disease burden associated with seasonal influenza provides guidance for estimating the burden of disease for seasonal influenza and other complementary purposes.

    Methodology

    Learn more about our Methodology here.