Artificial induction of immunity
Artificial induction of immunity is immunization achieved by human efforts in preventive healthcare, as opposed to natural immunity as produced by organisms' immune systems. It makes people immune to specific diseases by means other than waiting for them to catch the disease. The purpose is to reduce the risk of death and suffering, that is, the disease burden, even when eradication of the disease is not possible. Vaccination is the chief type of such immunization, greatly reducing the burden of vaccine-preventable diseases.
Platypus: monotremes lack placental transfer of immunity
Immunization, or immunisation, is the process by which an individual's immune system becomes fortified against an infectious agent.
Dr. Schreiber of San Augustine giving a typhoid inoculation at a rural school, San Augustine County, Texas. Transfer from U.S. Office of War Information, 1944.
Medical student participating in a polio vaccine campaign in Mexico
A simplified diagram showing the process of immunization through the production of anti-bodies