Question

question 4 of 10
vaccines protect an individual from contracting an infectious disease by
increasing their viral load.
stimulating their immune system.
removing all risk of infection.
all of the above
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Explanation:

Vaccines work by introducing antigens (inactivated or weakened pathogens or their parts) into the body. The immune system recognizes these antigens as foreign and mounts an immune response. This includes the production of antibodies and the activation of immune cells like T - cells. When the actual pathogen later infects the body, the immune system can quickly recognize and eliminate it due to the prior "training" from the vaccine. Increasing viral load would be harmful and is not a function of vaccines. Also, vaccines do not remove all risk of infection (e.g., due to factors like vaccine efficacy, new variants in some cases).

Answer:

stimulating their immune system.