![]() Some vaccines need to be given only once others require updates or "boosters" to maintain successful immunization and continued protection against disease. And because of immunizations, we've seen the near eradication of others, such as polio and smallpox. ![]() Over the years immunizations have thwarted epidemics of once common infectious diseases such as measles, mumps, and whooping cough. ![]() Immunizations protect us from serious diseases and also prevent the spread of those diseases to others. That's exactly what immunizations aim to do. ![]() It's much easier and more cost-effective to prevent a disease than to treat it. The goal of public health is to prevent disease. A vaccine will usually prevent the onset of a disease or else reduce its severity. Then, if you're ever again exposed to the actual disease-causing organism, your immune system is prepared to fight the infection. This triggers your body's immune response, causing it to either produce antibodies to that particular ailment or induce other processes that enhance immunity. When you get an immunization, you're injected with a weakened form of (or a fragment of) a disease. Immunizations, or vaccines as they're also known, safely and effectively use a small amount of a weakened or killed virus or bacteria or bits of lab-made protein that imitate the virus in order to prevent infection by that same virus or bacteria. ![]()
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