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The specific effectors evoked can be different based on the vaccine. [8] Live attenuated vaccines tend to help with the production of CD8+ cytotoxic T lymphocytes and T-dependent antibody responses. [8] A vaccine is only effective for as long as the body maintains a population of these cells. [8]
Contact immunity is the property of some vaccines, where a vaccinated individual can confer immunity upon unimmunized individuals through contact with bodily fluids or excrement. In other words, if person "A" has been vaccinated for virus X and person "B" has not, person "B" can receive immunity to virus X just by coming into contact with ...
This is an accepted version of this page This is the latest accepted revision, reviewed on 8 January 2025. Administration of a vaccine to protect against disease This article is about administration of a vaccine. For the vaccines themselves, see vaccine. See also: Immunization Medical intervention Vaccinations Girl about to be vaccinated in her upper arm ICD-9-CM 99.3 - 99.5 [edit on Wikidata ...
Here to clear up the difference between natural immunity, and vaccine-mediated immunity, is Dr. Theodore Bailey, Chief of GBMC’s Division of Infectious Disease.
Memory cells have a long life and last up to several decades in the body. [6] [2] Immunity to chickenpox, measles, and some other diseases lasts a lifetime. Immunity to many diseases eventually wears off. The immune system's response to a few diseases, such as dengue, counterproductively worsens the next infection (antibody-dependent ...
The vaccine is ineffective in children less than 2 years old, presumably due to their less mature immune systems. [41] Non-response is also common amongst older adults. [41] Immunity is not lifelong, so individuals must be re-vaccinated at age 65 if their initial vaccination was given at age 60 or younger. [41]