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Yellow fever vaccine is a vaccine that protects against yellow fever. [4] Yellow fever is a viral infection that occurs in Africa and South America. [4] Most people begin to develop immunity within ten days of vaccination and 99% are protected within one month, and this appears to be lifelong. [4] The vaccine can be used to control outbreaks of ...
This is an accepted version of this page This is the latest accepted revision, reviewed on 9 February 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 ...
Vaccines may be monovalent (also called univalent) or multivalent (also called polyvalent). A monovalent vaccine is designed to immunize against a single antigen or single microorganism. [82] A multivalent or polyvalent vaccine is designed to immunize against two or more strains of the same microorganism, or against two or more microorganisms. [83]
Similarly, waning vaccine-induced immunity, as occurs with acellular pertussis vaccines, requires higher levels of booster vaccination to sustain herd immunity. [ 2 ] [ 16 ] If a disease has ceased to be endemic to a population, then natural infections no longer contribute to a reduction in the fraction of the population that is susceptible.
Tetanus vaccine, also known as tetanus toxoid (TT), is a toxoid vaccine used to prevent tetanus. [2] During childhood, five doses are recommended, with a sixth given during adolescence. [2] After three doses, almost everyone is initially immune, [2] but additional doses every ten years are recommended to maintain immunity. [3]
Active immunity can also be generated artificially, through vaccination. The principle behind vaccination (also called immunization) is to introduce an antigen from a pathogen to stimulate the immune system and develop specific immunity against that particular pathogen without causing disease associated with that organism. [131]
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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 ...