Surveillance of influenza and other respiratory infections.
D005260:Female; D006306:Health Surveys; D006801:Humans; D015994:Incidence; D007251:Influenza, Human / Q000175:diagnosis / Q000453:epidemiology*; D008297:Male; D011159:Population Surveillance; D012141:Respiratory Tract Infections / Q000175:diagnosis / Q000453:epidemiology; D012307:Risk Factors; D006113:United Kingdom / Q000453:epidemiology