What are the basic epidemiological facts about Influenza A (H1N1)?
• Incubation period: most commonly around 3 days, but up to a maximum of 7 days • Period of communicability: from 24 hours prior to the onset of symptoms until either 7 days after onset of symptoms or until resolution of fever, whichever is longer • Means of virus transmission: most likely to be spread from person-to-person by inhalation of infectious droplets produced while talking, coughing and sneezing; transmission may also occur through direct and indirect (fomite) contact
