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Common Side Effects of the COVID-19 Vaccine While many people report no side effects from the vaccine, you may feel some symptoms, which means that the vaccine is working. The vaccine causes the body to have this immune response as a way to build its defenses against the virus - and this immune response may make some feel sick. This can help us understand why some may experience side effects after getting a vaccine. If your body ever identifies the real thing, it has the defenses needed to protect you. In response, your body creates antibodies that are specifically designed to attack this virus. This material tricks your body into thinking you have the live and working virus. Vaccines work by introducing material to your body that looks like a virus but won’t make you sick. This is called immunity, and it’s why you often don’t get sick from the same illness twice.
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Your body keeps these antibodies, which remember how to protect you if they meet the virus again. When your body identifies a virus, it creates defense molecules called antibodies that attack and destroy these germs. While side effects can be uncomfortable, they are actually a sign that the vaccine is doing its job by causing your body to build protection against the coronavirus.

COVID-19, on the other hand, can cause mild to severe symptoms that last days to weeks, and can be fatal. If there had been any severe or long-term side effects of the vaccine seen in the clinical trials, it would not have been released to the public.įortunately, most side effects of the vaccines are mild or moderate, and last one to two days. We know this because it was developed and tested through clinical trials in the exact same way as other vaccines. While some have reported side effects, it’s important to know that the COVID-19 vaccine is very safe. As more and more Americans get the COVID-19 vaccine, more of us have heard firsthand stories about the side effects that can come along with it.
