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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]
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]
An mRNA vaccine is a type of vaccine that uses a copy of a molecule called messenger RNA (mRNA) to produce an immune response. [1] The vaccine delivers molecules of antigen-encoding mRNA into cells, which use the designed mRNA as a blueprint to build foreign protein that would normally be produced by a pathogen (such as a virus) or by a cancer ...
During the worldwide Spanish flu pandemic of 1918, "Pharmacists tried everything they knew, everything they had ever heard of, from the ancient art of bleeding patients, to administering oxygen, to developing new vaccines and serums (chiefly against what we call Hemophilus influenzae – a name derived from the fact that it was originally considered the etiological agent – and several types ...
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]
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Assuming a vaccine is 100% effective, then the equation used for calculating the herd immunity threshold can be used for calculating the vaccination level needed to eliminate a disease, written as V c. [2] Vaccines are usually imperfect however, so the effectiveness, E, of a vaccine must be accounted for: