Some inoculations are also known as VACCINES. VACCINES are substances that are administered to people to help them develop immunity against certain diseases. VACCINES contain antigens, which are substances that stimulate the body's immune system to produce antibodies that fight off the disease. VACCINES are usually given in the form of injections, but they can also be taken orally or applied topically. VACCINES are an important part of preventive healthcare and have helped to reduce the incidence of many infectious diseases.