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  2. Influenza-like illness - Wikipedia

    en.wikipedia.org/wiki/Influenza-like_illness

    The term ILI can be used casually, but when used in the surveillance of influenza cases, can have a strict definition. The World Health Organization defines an illness as an ILI if the patient has a fever greater than or equal to 38 °C and a cough, which began in the last 10 days.