What Exactly Are Vaccines?
Vaccines help prepare the body’s immune system to fight the invasion of disease-causing organisms. Vaccines contain antigens, which look like the disease-causing organism to the immune system but don’t actually cause disease. When the vaccine is introduced to the body, the immune system is mildly stimulated. If a cat is ever exposed to the real disease, his immune system is now prepared to recognize and fight it off entirely or reduce its severity.
