Why are vaccines administered to patients?

Vaccines are primarily administered to provide immunity against specific infections. They work by introducing a harmless component of a pathogen (such as a protein or inactivated virus) into the body. This stimulates the immune system to recognize the pathogen as foreign, creating a memory of it. As a result, if the body is later exposed to the actual pathogen, the immune system can mount a rapid and effective response, preventing the disease from developing or significantly reducing its severity.

Curing diseases, alleviating symptoms, and increasing metabolic rates do not align with the primary purpose of vaccines. Vaccines are preventive measures rather than treatments for existing conditions or symptoms. They aim to prepare the immune system to defend against infections before they occur, thereby playing a crucial role in public health by controlling and eliminating diseases.