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The efficacy of intranasal live attenuated influenza vaccine in children 2 through 17 years of age: a meta-analysis of 8 randomized controlled studies.
Vaccine. 2012 Jan 20; 30(5):886-92.V

Abstract

BACKGROUND

Nine randomized controlled clinical trials, including approximately 26,000 children aged 6 months to 17 years, have evaluated the efficacy of live attenuated influenza vaccine (LAIV) against culture-confirmed influenza illness compared with placebo or trivalent inactivated influenza vaccine (TIV). The objective of the current analysis was to integrate available LAIV efficacy data in children aged 2-17 years, the group for whom LAIV is approved for use.

METHODS

A meta-analysis was conducted using all available randomized controlled trials and a fixed-effects model. Cases caused by drifted influenza B were analyzed as originally classified and with all antigenic variants classified as dissimilar.

RESULTS

Five placebo-controlled trials (4 were 2-season trials) and 3 single-season TIV-controlled trials were analyzed. Compared with placebo, year 1 efficacy of 2 doses of LAIV was 83% (95% CI: 78, 87) against antigenically similar strains; efficacy was 87% (95% CI: 78, 93), 86% (95% CI: 79, 91), and 76% (95% CI: 63, 84) for A/H1N1, A/H3N2, and B, respectively. Classifying B variants as dissimilar, efficacy against all similar strains was 87% (95% CI: 83, 91) and 93% (95% CI: 83, 97) against similar B strains. Year 2 efficacy was 87% (95% CI: 82, 91) against similar strains. Compared with TIV, LAIV recipients experienced 44% (95% CI: 28, 56) and 48% (95% CI: 38, 57) fewer cases of influenza illness caused by similar strains and all strains, respectively. LAIV efficacy estimates for children from Europe, the United States, and Middle East were robust and were similar to or higher than those for the overall population.

CONCLUSIONS

In children aged 2-17 years, LAIV demonstrated high efficacy after 2 doses in year 1 and revaccination in year 2, and greater efficacy compared with TIV. This meta-analysis provides precise estimates of LAIV efficacy among the approved pediatric age group.

Authors+Show Affiliations

Medical and Scientific Affairs, MedImmune, LLC, One MedImmune Way, Gaithersburg, MD 20878, USA. ambrosec@medimmune.comNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Meta-Analysis
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

22155144

Citation

Ambrose, Christopher S., et al. "The Efficacy of Intranasal Live Attenuated Influenza Vaccine in Children 2 Through 17 Years of Age: a Meta-analysis of 8 Randomized Controlled Studies." Vaccine, vol. 30, no. 5, 2012, pp. 886-92.
Ambrose CS, Wu X, Knuf M, et al. The efficacy of intranasal live attenuated influenza vaccine in children 2 through 17 years of age: a meta-analysis of 8 randomized controlled studies. Vaccine. 2012;30(5):886-92.
Ambrose, C. S., Wu, X., Knuf, M., & Wutzler, P. (2012). The efficacy of intranasal live attenuated influenza vaccine in children 2 through 17 years of age: a meta-analysis of 8 randomized controlled studies. Vaccine, 30(5), 886-92. https://doi.org/10.1016/j.vaccine.2011.11.104
Ambrose CS, et al. The Efficacy of Intranasal Live Attenuated Influenza Vaccine in Children 2 Through 17 Years of Age: a Meta-analysis of 8 Randomized Controlled Studies. Vaccine. 2012 Jan 20;30(5):886-92. PubMed PMID: 22155144.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - The efficacy of intranasal live attenuated influenza vaccine in children 2 through 17 years of age: a meta-analysis of 8 randomized controlled studies. AU - Ambrose,Christopher S, AU - Wu,Xionghua, AU - Knuf,Markus, AU - Wutzler,Peter, Y1 - 2011/12/07/ PY - 2011/09/07/received PY - 2011/11/18/revised PY - 2011/11/25/accepted PY - 2011/12/14/entrez PY - 2011/12/14/pubmed PY - 2012/5/4/medline SP - 886 EP - 92 JF - Vaccine JO - Vaccine VL - 30 IS - 5 N2 - BACKGROUND: Nine randomized controlled clinical trials, including approximately 26,000 children aged 6 months to 17 years, have evaluated the efficacy of live attenuated influenza vaccine (LAIV) against culture-confirmed influenza illness compared with placebo or trivalent inactivated influenza vaccine (TIV). The objective of the current analysis was to integrate available LAIV efficacy data in children aged 2-17 years, the group for whom LAIV is approved for use. METHODS: A meta-analysis was conducted using all available randomized controlled trials and a fixed-effects model. Cases caused by drifted influenza B were analyzed as originally classified and with all antigenic variants classified as dissimilar. RESULTS: Five placebo-controlled trials (4 were 2-season trials) and 3 single-season TIV-controlled trials were analyzed. Compared with placebo, year 1 efficacy of 2 doses of LAIV was 83% (95% CI: 78, 87) against antigenically similar strains; efficacy was 87% (95% CI: 78, 93), 86% (95% CI: 79, 91), and 76% (95% CI: 63, 84) for A/H1N1, A/H3N2, and B, respectively. Classifying B variants as dissimilar, efficacy against all similar strains was 87% (95% CI: 83, 91) and 93% (95% CI: 83, 97) against similar B strains. Year 2 efficacy was 87% (95% CI: 82, 91) against similar strains. Compared with TIV, LAIV recipients experienced 44% (95% CI: 28, 56) and 48% (95% CI: 38, 57) fewer cases of influenza illness caused by similar strains and all strains, respectively. LAIV efficacy estimates for children from Europe, the United States, and Middle East were robust and were similar to or higher than those for the overall population. CONCLUSIONS: In children aged 2-17 years, LAIV demonstrated high efficacy after 2 doses in year 1 and revaccination in year 2, and greater efficacy compared with TIV. This meta-analysis provides precise estimates of LAIV efficacy among the approved pediatric age group. SN - 1873-2518 UR - https://www.unboundmedicine.com/medline/citation/22155144/The_efficacy_of_intranasal_live_attenuated_influenza_vaccine_in_children_2_through_17_years_of_age:_a_meta_analysis_of_8_randomized_controlled_studies_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0264-410X(11)01900-1 DB - PRIME DP - Unbound Medicine ER -