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A US postmarketing evaluation of the frequency and safety of live attenuated influenza vaccine use in nonrecommended children younger than 5 years: 2009–2010 season
- Tennis, Patricia, Toback, Seth L., Andrews, Elizabeth B., McQuay, Lisa J., Ambrose, Christopher S.
- Vaccine 2012 v.30 no.42 pp. 6099-6102
- asthma, children, immunocompetence, influenza, risk, vaccination, vaccines, United States
- The 2007 US approval for use of Ann Arbor strain live attenuated influenza vaccine (LAIV) in children aged 24 through 59 months included precautions against use in (1) children <24 months and children aged 24 through 59 months with (2) asthma, (3) recurrent wheezing, and (4) altered immunocompetence. Results from the third season (2009–2010) of a 3-year study postmarketing commitment to monitor LAIV vaccination rates and frequency of hospitalizations or emergency department visits within 42 days after LAIV are reported here. As in the first 2 seasons, LAIV usage in cohorts 1, 2, and 4 were low relative to those in LAIV-recommended populations. The only numerically increased risk observed was for respiratory events in children aged <24 months administered LAIV, compared to those administered trivalent inactivated influenza vaccine (TIV). The number of children vaccinated with LAIV was small and precluded precise quantification of rare event.