How long can an infected person spread the H1N1 flu to others?
People infected with seasonal and the H1N1 flu virus may be able to infect others from 1 day before getting sick and should be considered potentially contagious as long as they are symptomatic and possibly for up to 5 7 days after the onset. This can be longer in some people, especially children and people with weakened immune systems and in people infected with the new H1N1 flu virus.
