does the flu shot work if you have the flu?
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It's safe to receive the flu shot if you're sick with a mild illness. Some examples of a mild illness include colds, sinus infections, and mild diarrhea. A good rule of thumb is to speak to your doctor prior to receiving the flu shot if you're currently sick with a fever or have a moderate to severe illness.
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Although immune responses may be lower in the elderly, studies have consistently found that flu vaccine has been effective in reducing the chance of medical visits and hospitalizations associated with flu.
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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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The 2017-2018 flu shot offered just 25 percent effectiveness against the predominant strain of flu that season, H3N2. But this year's shot offers 47 percent protection against all circulating strains, according to researchers at the U.S. Centers for Disease Control and Prevention.
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Fever and the flu vaccine If you're ill with a fever, it's best to delay your flu vaccination until you have recovered. There's no need to delay your flu vaccine if you have a minor illness with no fever, such as a cold.
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Sometimes people experience side effects from the flu shot that are similar to the early signs of the flu. These may include fever, tiredness and muscle aches. These side effects can start within a few hours of your being vaccinated and sometimes last for 1 or 2 days.
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The flu vaccine will be available as an injection or as a nasal spray. In recent years, there was concern that the nasal spray flu vaccine wasn't effective enough against certain types of flu. The nasal spray vaccine is expected to be more effective in the 2019-2020 season.
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Studies have shown that the flu vaccine will help prevent you getting the flu. It will not stop all flu viruses and the level of protection may vary, so it's not a 100% guarantee that you'll be flu-free.
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Getting a flu shot often protects you from coming down with the flu. And although the flu shot doesn't always provide total protection, it's worth getting. This year's annual flu shot will offer protection against three or four of the influenza viruses expected to be in circulation this flu season.
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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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According to the CDC, the flu vaccine reduces the odds of getting the flu by about 60%. But that number varies from year to year and among different groups of people. You may wonder why there's such a wide range. And in fact, it's even wider than it seems: that statistic only applies to healthy adults.
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A Flu Shot is not a Pneumonia Shot. A flu shot protects against the flu and its complications, which may include forms of pneumonia. But it does not offer protection against the most common type of pneumonia, pneumcoccal disease. If you get a flu shot, you may think you don't need a pneumonia shot.
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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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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 flu and fever Treat a case of the flu seriously, even if you don't have a fever. You are still contagious and your illness could progress and become a real concern, even if your temperature is not elevated.
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You can still get the flu vaccine if you have a mild illness, such as a cold or sinus infection. People who have a fever or a moderate or severe illness may need to delay vaccination until they've recovered.
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The injectable influenza virus vaccine (flu shot) is a "killed virus" vaccine. Influenza virus vaccine is also available in a nasal spray form, which is a "live virus" vaccine. Influenza virus vaccine works by exposing you to a small dose of the virus, which helps your body to develop immunity to the disease.