1. This video provides an introduction and basic overview of the Influenza Virologic Surveillance Right Size Sample Size Calculators. Subsequent videos go into more detail on how to use each of the three calculators.

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  2. The Influenza Virologic Surveillance Right Size Calculator A helps states determine the beginning and end of the influenza season and monitor the prevalence and spread of influenza viruses throughout the year. Please watch this video for detailed instructions on how to use Calculator A.

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  3. The Influenza Virologic Surveillance Sample Size Calculator B allows the user to answer multiple questions relating to rare and novel influenza viruses. Firstly, it helps states determine an appropriate sample size to detect a rare event/novel influenza virus among influenza positive surveillance specimens tested in all states at a low enough threshold for effective intervention and control measures. This objective relates to the initial detection of a novel virus which generally occurs as part of routine surveillance. Investigation of a novel event after initial detection (the "deep-dive") is a separate objective and addressed by using Calculator C.

    Calculator B also helps states determine an appropriate sample size to detect antiviral resistance virus among influenza positive surveillance specimens tested in all states at a low enough threshold for effective intervention and control measures.

    Please watch this tutorial video to learn how to use Calculator B!

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  4. The Influenza Virologic Surveillance Right Size Sample Size Calculator C allows the user to determine the prevalence of the novel virus (Novel Flu+/Total Flu+) within a state following detection of a novel influenza virus (i.e. "deep dive"); confirm that the prevalence of a rare event does not exceed a specific percent positivity. Investigation of a novel event is typically performed using enhanced, targeted surveillance. Watch this tutorial video to learn how to use Calculator C.

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Right Size Sample Size Calculators

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