Sep 17, 2024 · People with flu are most contagious during the first three days of their illness. Some people, including young children and people with weakened immune systems may be contagious for …

Mar 12, 2025 · Before Symptoms Appear: Flu viruses can spread one day before symptoms begin. This means you may unknowingly infect others before realizing you are sick. During Illness: People with …

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...

Jun 5, 2024 · The common flu is contagious by nature. But how long it remains contagious might depend upon a number of factors. Learn more to prevent it from spreading.

Nov 6, 2025 · People with the flu are most contagious in the three to four days after they develop symptoms, the CDC says. Most people can infect other people up to a day before their symptoms …

Dec 25, 2025 · Influenza, including Flu A, spreads efficiently through respiratory droplets and contaminated surfaces. People often underestimate contagious periods because symptoms may …

Sep 12, 2024 · You can be contagious with the flu a day before your symptoms begin. You’re most contagious in the first three to four days after you feel sick.

Jan 8, 2026 · How long is the flu contagious for? The CDC reports that people with the flu are most contagious during the first three days of their illness.

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 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 …