a substance used to stimulate the production of antibodies and provide immunity against one or several diseases, prepared from the causative agent of a disease, its products, or a synthetic substitute, treated to act as an antigen without inducing the disease
(1914–95), US microbiologist. He developed the standard Salk vaccine against polio, using virus inactivated by formalin, in the early 1950s. He later became the director of the institute in San Diego that bears his name
(1906–93), US physician; born in Russia. He developed the orally administered Sabin vaccine against poliomyelitis that was adopted by the World Health Organization in the late 1950s
I've learned my lesson!