Passive immunity

In immunology, passive immunity is the transfer of active humoral immunity of ready-made antibodies. Passive immunity can occur naturally, when maternal antibodies are transferred to the fetus through the placenta, and it can also be induced artificially, when high levels of antibodies specific to a pathogen or toxin (obtained from humans, horses, or other animals) are transferred to non-immune persons through blood products that contain antibodies, such as in immunoglobulin therapy or antiserum therapy.[1] Passive immunization is used when there is a high risk of infection and insufficient time for the body to develop its own immune response, or to reduce the symptoms of ongoing or immunosuppressive diseases.[2] Passive immunization can be provided when people cannot synthesize antibodies, and when they have been exposed to a disease that they do not have immunity against.[3]

  1. ^ "Vaccines: Vac-Gen/Immunity Types". www.cdc.gov. Archived from the original on 2011-12-22. Retrieved 2015-11-20.
  2. ^ "Microbiology/Virology/Immunology/Bacteriology/Parasitology Text Book On-line". www.microbiologybook.org. Archived from the original on 2021-05-30. Retrieved 2023-09-28.
  3. ^ "Passive Immunization - Infectious Diseases". Merck Manuals Professional Edition. Archived from the original on 2020-04-08. Retrieved 2015-11-12.