How long is the incubation period for H1N1 Influenza 09?
The incubation period is the time between being infected and symptoms appearing. Because this is a new type of influenza, urgent work is still being done to find out as much as we can about it. We know that people with seasonal influenza generally start having symptoms between one to four days after being infected. In the case of H1N1 Influenza 09, symptoms usually start between two to four days after being infected.
