Re: "Medical practice-based influenza surveillance: viral prevalence and assessment of morbidity".
Matter
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Zwahlen
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Cloetta
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Helbling
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Zimmermann
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D000328:Adult; D017677:Age Distribution; D002648:Child; D006801:Humans; D015994:Incidence; D007251:Influenza, Human / Q000453:epidemiology* / Q000821:virology; D008824:Michigan / Q000453:epidemiology; D009017:Morbidity; D015995:Prevalence; D018571:Sentinel Surveillance; D013557:Switzerland / Q000453:epidemiology