why sick after flu shot?
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But you might develop flu-like symptoms — despite getting a flu vaccine — for a variety of reasons, including: Reaction to the vaccine. Some people experience muscle aches and a fever for a day or two after receiving a flu vaccine. This may be a side effect of your body's production of protective antibodies.
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Soreness, redness, or swelling where the shot was given are common after yellow fever vaccine. Fever sometimes happens. Headache and muscle aches can occur. More serious reactions happen rarely after yellow fever vaccine.
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Myth #6: Flu shot side effects are worse than the flu itself The flu vaccine can occasionally cause side effects such as mild aches, fatigue, headache, or fever. Like other injections, a flu shot can cause fainting. The most common side effect is discomfort or minor pain around the site of the injection.
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With a weakened immune system, your body may not be able to get over the foreign bacteria and viruses. This is how those with influenza can easily turn their flu into something much worse — pneumonia. Pneumonia is an infection that causes inflammation in the lungs.
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Influenza (flu). Caused by the influenza virus, the flu is more serious than the common cold and infects the lungs, throat and nose. Symptoms include sudden fever or feeling feverish, chills, cough, sore throat, loss of appetite, muscle aches, fatigue, runny nose, sneezing and watery eyes.
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A: Like the flu shot, the flu nasal spray — also called the live attenuated influenza vaccine (LAIV) — may cause headache, dizziness, fainting, and a slight fever. However, the nasal spray can also cause other side effects that the shot doesn't, including tiredness, loss of appetite, runny nose, and sore throat.
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There is no side-stepping the fact that flu shots can cause side effects, especially in younger children who may be getting their shots for the first time. Most typically last a day or two and are almost always mild. Possible flu shot reactions may include: Fatigue.
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It may keep you from getting the flu. If you do get the flu, you may not get as sick as you would have gotten without the vaccine, or you may be less likely to develop serious complications like pneumonia. If you don't get the flu, you can't pass it on.
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According to the CDC, mild side effects from the flu shot include soreness, redness or swelling at the injection site, low-grade fever and aches. Only about 1 percent to 2 percent of people who get a flu shot will have fever as a side effect, Schaffner said.
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The most common side effect of the flu shot is a reaction at the injection site, which is typically on the upper arm. After the shot is given, you may have soreness, redness, warmth, and in some cases, slight swelling. These effects usually last less than two days.
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Flu vaccines cause antibodies to develop in the body about two weeks after vaccination. These antibodies provide protection against infection with the viruses that are used to make the vaccine.
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The flu vaccine only protects against influenza, not other illnesses. Another explanation is that it is possible to be exposed to influenza viruses, which cause the flu, shortly before getting vaccinated or during the two-week period after vaccination that it takes the body to develop immune protection.
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After your shot, you might have headaches or some achiness and pain in the muscles throughout your body. This also usually happens on the first day and goes away within two days.
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Symptoms usually appear from one to four days after exposure to the virus, and they last five to seven days. For people who've had a flu shot, the symptoms may last a shorter amount of time, or be less severe. For other people, the symptoms may last longer. Even when symptoms resolve, you may continue to feel fatigued.
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Some older people and people with certain medical conditions may develop less immunity after receiving a flu shot. Reviews of past studies have found that, on average, the flu vaccine is about 50% to 60% effective for healthy adults who are between 18 and 64 years old. The vaccine may sometimes be less effective.
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Symptoms usually appear from one to four days after exposure to the virus, and they last five to seven days. For people who've had a flu shot, the symptoms may last a shorter amount of time, or be less severe.
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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.