Adverse reactions to vaccines practice parameter 2012 update
Mild local reactions and fever after vaccinations are common and do not contraindicate future doses. Anaphylactic reactions to vaccines are rare and should be evaluated with skin tests to the vaccine and its components. If the skin test results are negative, subsequent doses can be administered in the usual manner but under observation. If the skin test results are positive and the patient requires subsequent doses, the vaccine can be administered in graded doses under observation. Some nonanaphylactic reactions to vaccines might also require evaluation, but only a few are contraindications to future doses. Pregnant women and persons who are immune compromised should generally not receive live vaccines. Purported long-term sequelae of vaccination, such as autism, are not supported by epidemiologic studies. Patients with egg allergy of any severity should receive annual influenza vaccinations because studies have demonstrated a very low rate of reactions. Studies to date have evaluated the injectable trivalent influenza vaccine (TIV), and thus TIV, rather than the live attenuated influenza vaccine (LAIV), should be used for recipients with egg allergy. All influenza vaccines available in the United States contain low amounts of ovalbumin. Neither skin testing with the vaccine nor dividing the dose is required; however, the vaccine should be administered in a setting in which anaphylaxis can be recognized and treated.
Available from: PubMed Central
- "When used in vaccines, gelatin is extensively cross-reactive and is of bovine or porcine origin [14-16]. Gelatin is used as a stabilizer in attenuated viral-containing vaccines such as Japanese encephalitis virus, varicella and MMR (Table 3) and causes the most allergic reactions compared with other vaccine components . In Japan, after the introduction of vaccines not containing gelatin, the incidence of allergic reactions sharply declined [18,19]. "
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ABSTRACT: Currently, the increasing numbers of vaccine administrations are associated with increased reports of adverse vaccine reactions. Whilst the general adverse reactions including allergic reactions caused by the vaccine itself or the vaccine components, are rare, they can in some circumstances be serious and even fatal. In accordance with many IgE-mediated reactions and immediate-type allergic reactions, the primary allergens are proteins. The proteins most often implicated in vaccine allergies are egg and gelatin, with perhaps rare reactions to yeast or latex. Numerous studies have demonstrated that the injectable influenza vaccine can be safely administered, although with appropriate precautions, to patients with severe egg allergy, as the current influenza vaccines contain small trace amounts of egg protein. If an allergy is suspected, an accurate examination followed by algorithms is vital for correct diagnosis, treatment and decision regarding re-vaccination in patients with immediate-type reactions to vaccines. Facilities and health care professionals should be available to treat immediate hypersensitivity reactions (anaphylaxis) in all settings where vaccines are administered.
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ABSTRACT: This review highlights some of the research advances in anaphylaxis; hypersensitivity reactions to foods, drugs, and insects; and allergic skin diseases that were reported in the Journal in 2011. Food allergy appears to be increasing in prevalence and carries a strong economic burden. Risk factors can include dietary ones, such as deficiency of vitamin D and timing of complementary foods, and genetic factors, such as filaggrin loss-of-function mutations. Novel mechanisms underlying food allergy include the role of invariant natural killer T cells and influences of dietary components, such as isoflavones. Among numerous preclinical and clinical treatment studies, promising observations include the efficacy of sublingual and oral immunotherapy, a Chinese herbal remedy showing promising in vitro results, the potential immunotherapeutic effects of having children ingest foods with baked-in milk if they tolerate it, and the use of anti-IgE with or without concomitant immunotherapy. Studies of allergic skin diseases, anaphylaxis, and hypersensitivity to drugs and insect venom are elucidating cellular mechanisms, improved diagnostics, and potential targets for future treatment. The role of skin barrier abnormalities, as well as the modulatory effects of the innate and adaptive immune responses, are major areas of investigation.
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