Which best describes how a vaccine works L?

A vaccine works by introducing a harmless component of a pathogen, such as a protein or inactivated virus, into the body, stimulating the immune system to recognize and respond to it. This exposure trains the immune system to identify and combat the actual pathogen if encountered in the future. As a result, vaccines create memory cells that provide long-lasting immunity, reducing the risk of disease. Ultimately, vaccines help prevent infections and control the spread of contagious diseases.