👉 A vaccine is a type of medicine that helps protect against an illness by stimulating the body's immune system to produce antibodies or titering them in response to infection. It is usually administered through injection, and its effectiveness can vary depending on factors such as age, health status, and how well the immune system responds. Vaccines are used in a variety of settings, including healthcare facilities, schools, workplaces, and individuals who may be at risk for certain diseases.
