39. NCER Exempler XVIII

Vaccines work by introducing a of aharmful part harmless part pathogen, such as a protein or a weakened form of thevirus or bacteriumvirus or fungi , into the body. This prompts the immune systemnervous system to recognize it as a threat and produce antibodies to fight it. These antibodiesantigens remain in the body as a memory of the pathogen.

 

If the person is later exposed to the actual pathogen, their immune system can rapidly respond, preventing or reducing the severity of the infection. In this way, vaccines provide toimmunity vulnarability specific diseases, ultimately protecting individuals and contributing to herd immunity within populations, reducing the overall spread of infectious diseases.