How do vaccines work?
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3 Answers
Vaccines work by stimulating the immune system to recognize and defend against specific pathogens. They contain weakened or inactivated forms of the pathogen, parts of the pathogen, or modified toxins produced by the pathogen. When a vaccine is administered, the body recognizes these components as foreign and mounts an immune response, producing antibodies and activating immune cells specific to the pathogen. This immune response creates a memory of the pathogen, so if the person is later exposed to the actual infectious pathogen, their immune system can quickly recognize and mount a defense, preventing or reducing the severity of the disease. Vaccines have been instrumental in preventing numerous diseases and have played a crucial role in public health by reducing the spread of infections and saving lives.
Vaccines work by introducing a weakened or dead virus or bacteria into the body, which triggers an immune response. The immune system then produces antibodies to fight off the virus or bacteria. This creates immunity, so if the person is exposed to the virus or bacteria again, their immune system can quickly respond and fight off the infection.
Vaccines work by introducing a weakened or inactivated form of a disease-causing pathogen or a piece of its genetic material (such as a protein) into the body. This triggers the immune system to produce an immune response, which includes the production of antibodies that can recognize and fight off the actual pathogen if the person is later exposed to it. This creates immunity to the disease without the person having to experience the symptoms of the actual disease.