Sep 17, 2024 · When Are People with Flu Contagious? Influenza viruses can be detected in most infected persons beginning one day before symptoms develop and up to five to seven days after …

Mar 12, 2025 · The flu is most contagious in the first three to four days after you begin showing symptoms, but waiting at least five to seven days is recommended. Exception: Some people may …

Jun 5, 2024 · You can spread the flu before you feel ill, but you're typically most contagious during the first 3 days of your illness. People are usually contagious up to a week after they develop symptoms.

Jan 6, 2026 · Those with flu are most contagious around three days into their infection, according to the Centers for Disease Control and Prevention, but some people, like young children and those with...

Dec 19, 2025 · People with the flu can spread the virus to others 1 day before symptoms start and up to 5 to 7 days after becoming ill. The flu spreads mostly through tiny respiratory droplets in the air....

Feb 1, 2026 · How long are you contagious with the flu? Experts say you can spread the virus for five to seven days after symptoms start, sometimes longer for children and adults.

Sep 17, 2025 · To prevent spreading the flu, wash your hands often and stay home if you are sick. The flu is extremely contagious. 1 The influenza virus, which causes the flu, spreads easily—especially in …

Dec 24, 2025 · People with the flu are most contagious in the first three to four days of their infection, TODAY.com explained previously. However, people with weakened immune systems and young …

Sep 10, 2025 · When it comes to the flu, timing is everything. You can be contagious before symptoms even appear and unknowingly spread the virus to others. Determining when you’re no longer …

Sep 12, 2024 · You’ll be most contagious with the flu during the first three or four days after you feel ill. Germs may still be shared for a week after symptoms start, too.