Artificial passive immunity is a type of immunity that is induced via vaccinations. A person's passive immunity is immunity that occurs naturally. At birth, mothers transfer maternal antibodies to their children and form their child's passive immunity.
Vaccinations comprised of antibodies induce artificial, or acquired, passive immunity. Antibodies that are transferred to people via vaccinations are either synthesized from human or non-human sources. Humans who have already been exposed to an illness and have fought off the illness have antibodies to said illness in their blood. These antibodies can be purified from the person's blood and then injected into another patient to provide artificial passive immunity to the same illness. Horses, sheep and rabbits have all also provided antibodies used in vaccinations.