alexa Adverse events reported following live, cold-adapted, intranasal influenza vaccine.
Immunology

Immunology

Journal of Vaccines & Vaccination

Author(s): Izurieta HS, Haber P, Wise RP, Iskander J, Pratt D,

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Abstract CONTEXT: In June 2003, the US Food and Drug Administration licensed a trivalent live, attenuated influenza vaccine (LAIV-T) for intranasal administration to healthy persons 5 to 49 years of age. Although prelicensure testing involved 20 228 vaccinees, clinical trials were not of sufficient size to detect rare adverse events reliably. OBJECTIVE: To identify adverse events reported following LAIV-T administration after licensure. DESIGN, SETTING, AND PARTICIPANTS: All adverse events reported to the US Vaccine Adverse Event Reporting System (VAERS) during the 2003-2004 and the 2004-2005 influenza seasons. MAIN OUTCOME MEASURES: Numbers and proportions of reported adverse events and reporting rates of adverse events per 100,000 vaccinees. RESULTS: Approximately 2,500,000 persons received LAIV-T during the first 2 postlicensure seasons. As of August 16, 2005, VAERS received 460 adverse event reports for vaccinations received from August 2003 through July 2005. No fatalities were reported. There were 7 reports of possible anaphylaxis, 2 reports of Guillain-Barré syndrome, 1 report of Bell palsy, and 8 reports of asthma exacerbation among individuals with a prior asthma history. Events in individuals for whom the vaccine was not indicated accounted for 73 reports (16\%). CONCLUSIONS: Reports to VAERS in the first 2 seasons of LAIV-T use did not identify any unexpected serious risks with this vaccine when used according to approved indications. Like many vaccines and other medical products, LAIV-T may rarely cause anaphylaxis. Secondary transmission of the vaccine virus merits further investigation. Reports of asthma exacerbations in vaccinees with prior asthma history highlight the risks of vaccine use inconsistent with approved labeling. This article was published in JAMA and referenced in Journal of Vaccines & Vaccination

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