how long does it take to have flu symptoms once exposed?
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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.
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When Flu Spreads 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. Children and some people with weakened immune systems may pass the virus for longer than 7 days.
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The most common side effects from flu shots are soreness, redness, tenderness or swelling where the shot was given. Low-grade fever, headache and muscle aches also may occur. If these reactions occur, they usually begin soon after the shot and last 1-2 days.
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Signs and symptoms appear around 1 to 3 days after exposure to an infectious person. Sore throat, fever (high temperature) and swollen tonsils and neck glands are the typical first symptoms. A fine red (scarlet) rash develops 12 to 48 hours after symptoms begin.
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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. Symptoms of a common cold usually appear one to three days after exposure to a cold-causing virus.
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Flu is usually most infectious from the day your symptoms start and for a further 3 to 7 days. Children and people with lowered immune systems may be infectious for a few days longer.
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For most healthy people, the flu is an uncomfortable but short-term illness that resolves itself as the immune system fights it off. Symptoms usually appear from one to four days after exposure to the virus, and they last five to seven days.
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Symptoms usually appear within 2 weeks of exposure. The first outbreak is usually the worst. At first, you might develop some flu-like symptoms. Then you might feel itchy or have an uncomfortable feeling around your genitals or mouth before the lesions appear.
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Flu symptoms in children usually start to occur around two days after exposure to the virus. These symptoms typically last five to seven days, though they can last up to two weeks.
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Symptoms usually appear 10–90 days after infection, with 21 days being the average.
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Symptoms begin 6 – 24 hours after exposure: Diarrhea, stomach cramps. Vomiting and fever are uncommon. Usually begins suddenly and lasts for less than 24 hours.
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Infection can occur at any point between 6 to 24 hours after exposure but usually happens within 8 to 12 hours. Symptoms include diarrhea and abdominal pain. Most people do not experience fever or vomiting. Symptoms often begin suddenly and stop within 24 hours.
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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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The first signs of illness can appear from 3 to over 25 days after a person becomes infected. The infection can last for months if untreated.
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If you have the flu, you'll be contagious one day before developing symptoms and up to five to seven days after becoming ill. Younger children or people with a weakened immune system may be contagious for longer. The influenza virus can also survive on surfaces, such as doorknobs and tables, for up to 24 hours.
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The symptoms of flu usually develop within 1 to 3 days of becoming infected. Most people will feel better within a week. However, you may have a lingering cough and still feel very tired for a further couple of weeks.