The flu nasal spray vaccine, which is approved for healthy, non-pregnant people ages 2 to 49, can cause a slightly different set of side effects compared with other types of flu shots. In addition, it's important to ask your health care provider to file a Vaccine Adverse Event Reporting System report either online or by calling VAERS at 1-80, the CDC says. If you experience serious side effects, you should seek medical care immediately. Symptoms of serious side effects include difficulty breathing, swelling around the eyes or lips, hives, racing heart, dizziness and high fever, according to the CDC. Rare but serious side effects can occur, including allergic reactions. These mild effects should go away within a few days. Only about 1% to 2% of people who get a flu shot will have fever as a side effect, Schaffner said. Flu shot side effectsĪccording to the CDC, mild side effects from the flu shot include soreness, redness or swelling at the injection site low-grade fever and aches. However, if you have a minor illness, like a mild cold or a headache, you may still be able to get a flu shot. You should not get the flu vaccine if you have a high fever you should wait until the fever is gone, according to Schaffner. If you're not feeling well, you should talk to your doctor before getting a flu shot while you have symptoms. The cause of GBS is not known, but it is often linked with infections with viruses or bacteria and in very rare cases, the condition has been linked with flu vaccination. Some people with this condition cannot get a flu shot, according to the CDC. People with a history of Guillain-Barré syndrome (GBS), a rare, acute autoimmune disease that can cause paralysis, should talk with their doctor about whether they can get a flu vaccine. In addition, several types of flu shots are egg-free, including recombinant flu vaccines and cell-based flu vaccines. People who've had a severe allergic reaction to eggs should get their flu shot under the supervision of a health care provider who can treat severe allergic reactions, the CDC says. Studies have found that people with egg allergies are very unlikely to experience a severe reaction to flu vaccines. People with egg allergies can still receive any type of flu shot that's recommended for their age group, even if the flu shot is made with egg-based technology (and thus contains a small amount of egg protein), according to the CDC. These other ingredients might include gelatin or antibiotics, which are added to some flu shots to prevent bacterial contamination during manufacturing. Similarly, people who have had a life-threatening reaction to flu-vaccine ingredients besides egg proteins shouldn't get flu vaccines with those ingredients, and they should speak with their health care provider about whether there is a flu vaccine that's right for them, the CDC says. Those who have had a severe allergic reaction to a flu vaccine in the past should not get that type of flu shot again, and they should speak with their health care provider about whether they can receive another type of flu shot, according to the CDC. Who should NOT get a flu vaccine?Ĭhildren younger than 6 months cannot get a flu shot. People can visit the CDC's website to find flu shot locations. Each season's flu shot expires in June of that year, but Schaffner said he would consider it "too late" to get a flu vaccine after March, unless a person is traveling to the Southern Hemisphere (where the flu season will then be starting).Īfter vaccination, it takes a person about two weeks to build up immunity against the flu. Most flu vaccines are given before Thanksgiving, Schaffner said, but people can still get their shot throughout the winter months. "We'd like to get as many people protected against influenza before influenza becomes active in communities across the country," Schaffner said.
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