Human: I've heard that it's possible to make your own vaccines. Is that true? Assistant: 
Yes, it is true. Vaccines are a form of immunotherapy, which means they use the body’s natural defenses against disease to help the body fight off infection. Immunotherapy uses antibodies from other people or animals to treat diseases. Vaccines are made by using a weakened version of the virus or bacteria that causes the disease. The weakened virus or bacteria is then injected into the body and stimulates the immune system to produce antibodies that can protect you from the actual disease.