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Incubation Period. According to the CDC, although the incubation period can range from one to four days, the typical incubation period is two days. People can begin infecting others about one day before any symptoms of the virus appear, and are contagious for about a week after that.nfluenza is a highly contagious respiratory illness. According to the Centers for Disease Control and Prevention, every year between 5 and 20 percent of people in the United States get the flu.
It does not cause epidemics and does not have the severe public health impact that influenza types A and B do. The typical incubation period for influenza is 1 to 4 days, with an average of 2 days. Adults can be infectious from the day before symptoms begin through approximately 5 days after illness onset.Children can be infectious for. The incubation period of swine flu is one to 7 days. 2  People may be contagious from one day before they develop symptoms to up to 7 days after they get sick. 3  There are two influenza antiviral medications that are currently effective against H1N1 flu.