how long before symptoms are you contagious with 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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With norovirus — the most common cause of viral gastroenteritis in adults — you're contagious when you begin to feel ill. 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.
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Pittman notes individuals with the flu can be contagious for up to three weeks after the onset of symptoms. “In many cases, just because you or your children are fever free and can return to work or school does not mean you are no longer contagious.
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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.
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For example, most common cause of stomach flu is Norovirus. It has an incubation period of about 12 - 48 hours, and can cause the person to be contagious during the incubation period and for as long as they shed virus (usually about three days after symptoms stop but sometimes up to two weeks).
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Dr. Clements: When you get infected with the flu virus, it multiplies quietly in body until you get symptoms of the disease and start excreting enough virus to give to someone else. That's the incubation period. For the flu, it is about two to five days.
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If you have flu, you generally start to feel ill within a few days of being infected. You should begin to feel much better within a week or so, although you may feel tired for much longer. You'll usually be most infectious from the day your symptoms start and for a further 3 to 7 days.
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How long am I contagious after the flu? After I take Tamiflu? The Centers for Disease Control and Prevention (CDC) recommends people with the flu to stay home until 24 hours after they are fever free without the use of a fever-reducing medication.
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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 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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Symptoms can begin about 1 to 4 days, or an average of 2 days, after a person is first exposed to the influenza virus. Fever and other symptoms can usually last up to 7 to 10 days, but the cough and weakness may last 1 to 2 weeks longer.
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About a week. 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. The virus can be spread until symptoms disappear.
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People who have mono can be contagious from the time they first become infected. But they may not know that they have the virus. It takes a while for mono symptoms (like tiredness, fever, muscle aches, headache, or sore throat) to show up — about 1–2 months, in fact. This is called the incubation period.
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For colds, most individuals become contagious about a day before cold symptoms develop and remain contagious for about five to seven days. Some children may pass the flu viruses for longer than seven days (occasionally for two weeks).
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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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When Flu Spreads 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.
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Although you were exposed to flu, you do not have any symptoms. 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.