What is the purpose of a vaccine?

The purpose of a vaccine is to stimulate immunity via antibody production. Vaccines are designed to mimic infections, allowing the immune system to recognize and respond to specific pathogens without causing the disease itself. When a vaccine is introduced into the body, it prompts the immune system to produce antibodies and develop memory cells, which remain in the body to provide protection against future infections by the same pathogen. This mechanism is essential for preventing diseases and controlling outbreaks.

The other options focus on aspects of disease management rather than immunization. Curing diseases involves treating an existing infection, which vaccines do not do since they work proactively. Alleviating symptoms pertains to managing the effects of a disease rather than preventing it. Promoting healing is related to recovery from an illness or injury, while vaccines are preventative measures aimed at fostering an immune response to avert disease altogether.