how long are you contagious after having the flu?
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When Flu Spreads People with flu are most contagious in the first three to four days after their illness begins. Most healthy adults may be able to infect others beginning 1 day before symptoms develop and up to 5 to 7 days after becoming sick.
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Symptoms can begin about 2 days (but can range from 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.
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Avoid touching your mouth, nose, or eyes. That's not easy to do, so keep those hands clean. If you have flu-like symptoms -- fever plus at least cough or sore throat or other flu symptoms -- stay home for seven days after symptoms begin or until you've been symptom-free for 24 hours -- whichever is longer.
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It takes up to two weeks to build immunity after a flu shot, but you can benefit from the vaccine even if you don't get it until after the flu season starts. It's usually best for people in the United States to get their flu vaccine by the end of October.
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How long does it take to develop symptoms of influenza after being exposed? The incubation period of influenza is usually two days but can range from one to four days.
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Call Doctor or Seek Care Now. Close Contact (exposure) with flu (influenza) within last 72 hours (3 days) and you are at High Risk of problems from the flu. See High Risk list; such as age more than 64, pregnant, chronic illness.
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You're generally contagious with a cold 1-2 days before your symptoms start, and you could be contagious as long as your symptoms are present—in rare cases, up to 2 weeks.
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Symptoms usually start within 1 to 4 days of close contact with another person with flu. Seven days is an outer limit. Since 7 days have passed, you should be safe and not get the flu from this exposure.
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Typically, you're contagious from 1 day before you have any symptoms. You stay that way for 5 to 7 days after you start feeling sick.
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What You Should Know - Influenza Exposure Within Past 7 Days: Although you were exposed to flu, you do not have any symptoms (such as cough or fever). Symptoms usually start within 1 to 4 days of close contact with another person with flu.
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For most flu viruses, that window is about a week, starting from a day before your symptoms appear, to six or seven days afterward. For colds, even people who are feeling better can spread the virus to others for up to three weeks.
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Symptoms usually appear within one to two days of exposure. Although you typically feel better after a day or two, you're contagious for a few days after you recover. The virus can remain in your stool for up to two weeks or more after recovery.
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These illnesses have an incubation period of between two to six days. People typically start to become contagious in the hours preceding the initial onset of symptoms and remain contagious until the symptoms go away.
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When you get infected, you typically start to show symptoms about 2 to 5 days after you were exposed to the bacteria. You can stay contagious for up to a month if you don't get treated. Antibiotics can prevent the infection from spreading. People who take antibiotics stop being contagious after about 24 hours.
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If you have norovirus, you're contagious from the moment your symptoms start until at least 3 days after recovery. Some people might be contagious for as long as 2 weeks after they recover.
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How long are people infectious? People infected with a norovirus are contagious from the moment they begin feeling ill to at least three days after recovery. Some people may be contagious for as long as two weeks after recovery.
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You're contagious from about 6 days after the start of cold-like symptoms to 3 weeks after the coughing starts. If you start antibiotics within 3 weeks of starting to cough, it will reduce the time you're contagious for.