How does flu spread?
Flu viruses are thought to spread mainly from person to person through droplets made when people with
flu cough, sneeze, or talk. Less often, a person might get flu by touching a surface or object that has flu
virus on it and then touching his or her own mouth, nose, or possibly eyes. Many other viruses spread
these ways too. People infected with flu may be able to infect others beginning 1 day before symptoms
develop and up to 5-7 days after becoming sick. That means you may be able to spread flu to someone
else before you know you are sick as well as while you are sick. Young children, those who are severely
ill, and those who have severely weakened immune systems may be able to infect others for longer than