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Flu Contagious Period. Flu starts being contagious about 24 hours before you have symptoms. You're most contagious when you first get sick and for the following 2 to 3 days. The severity of your symptoms correlates to how many new viruses are being produced, so you're less contagious as you start to feel better. Most people stop being infectious approximately 5 to 7 days after getting sick, but you can remain contagious for as long as 10 days. Limiting Flu Spread To limit the spread of flu, the Centers for Disease Control and Prevention recommends staying home while you're sick and for at least 24 hours after your fever breaks.
The Flu Is Contagious. Most healthy adults may be able to infect other people beginning 1 day before symptoms develop and up to 5 to 7 days after becoming sick. Children may pass the virus for longer than 7 days. Symptoms start 1 to 4 days after the virus enters the body.That means that you may be able to pass on the flu to someone else before you know you are sick, as well as while you are sick. Some people can be infected with the flu virus but have no symptoms.erson to Person. People with flu can spread it to others up to about 6 feet away. Most experts think that flu viruses are spread mainly by droplets made when people with flu cough, sneeze or talk.