Vaccine Definition & Importance
Vaccines are substances that help to stimulate a person's immune system to recognize and fight off specific diseases. They are used to prevent or reduce the risk of infection from various diseases, including measles, polio, tetanus, diphtheria, and COVID-19, among others.
Vaccines work by introducing a weakened or inactivated form of the virus or bacteria that causes the disease into the body. This trains the immune system to recognize and fight off the pathogen if it encounters it again in the future.
Vaccination is widely considered to be one of the most effective public health interventions, and has led to the eradication of smallpox and the control of many other diseases. However, despite their proven efficacy, some people remain skeptical of vaccines, and there is ongoing debate about their safety and efficacy.
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