Vaccines are injections (shots), liquids, pills, or nasal sprays that you take to teach your body's immune system to recognize and defend against harmful germs. For example, there are vaccines to protect against diseases caused by: Viruses, like the ones that cause the flu and COVID-19, Bacteria, including tetanus, diphtheria, and pertussis. Immunization is the process of becoming protected against a disease. But it can also mean the same thing as vaccination, which is getting a vaccine to become protected against a disease. Vaccines are important because they protect you against many diseases. These diseases can be very serious. So getting immunity from a vaccine is safer than getting immunity by being sick with the disease. And for a few vaccines, getting vaccinated can actually give you a better immune response than getting the disease would. But vaccines don't just protect you. They also protect the people around you through community immunity. Vaccines are safe. They must go through extensive safety testing and evaluation before they are approved in the United States.
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