Vaccines

Vaccines are medical preparations that train your immune system to recognize and fight specific diseases without you actually getting sick. They contain weakened or inactive versions of disease-causing pathogens, or instructions for your body to make harmless versions of them, allowing your immune cells to learn how to respond quickly if they encounter the real threat in the future. By preparing your body's defenses in advance, vaccines prevent serious illnesses and help protect entire communities by reducing how easily diseases can spread from person to person.