Vaccines work by training the immune system to recognize and fight harmful viruses or bacteria without causing illness. They contain small, harmless parts of the germslike proteins or weakened versionsthat stimulate the body's natural defenses. Once the immune system has learned to identify the threat, it creates memory cells that can respond quickly if the real virus or bacteria enters the body in the future.

Vaccination is one of the most effective ways to prevent serious diseases, such as measles, polio, and influenza. It not only protects the individual who receives the vaccine but also helps protect entire communities through herd immunity. This occurs when enough people are vaccinated to stop the spread of disease, especially protecting those who cannot be vaccinated due to health conditions. Thanks to vaccines, many deadly diseases have been reduced or even eliminated around the world. Shutdown123