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Pediatr Infect Dis J. 2008 Aug;27(8):744-8. doi: 10.1097/INF.0b013e318174e0f8.

Duration of protection provided by live attenuated influenza vaccine in children.

Author information

  • 1MedImmune, One MedImmune Way, Gaithersburg, MD 20878, USA. ambrosec@medimmune.com

Abstract

BACKGROUND:

Reliable availability of influenza vaccine before October could enable the vaccination of many children who might not otherwise be vaccinated.

METHODS:

Available data for children were analyzed to describe protection provided by live attenuated influenza vaccine (LAIV) for greater than 5 months postvaccination.

RESULTS:

Four studies conducted in children aged 6 months to 18 years were identified. Culture-confirmed efficacy against A/H1N1 and A/H3N2 strains at 9-12 months postvaccination was 77% [95% confidence interval (CI): 53-89%] to 100% (95% CI: 68-100%) and through a second influenza season without revaccination was 56% (95% CI: 31-73%) and 57% (95% CI: 6-82%), respectively. Against B strains, 1 study demonstrated 86% (95% CI: 59-95%) efficacy at 5-7 months. Another study demonstrated 27% (95% CI: -62% to 67%) efficacy at 9-12 months compared with 74% (95% CI: 39-89%) at 1 to <5 months during a period of antigenic drift for circulating B strains. A third study estimated 50% (95% CI: -49% to 83%) efficacy against influenza B strains through a second season without revaccination.

CONCLUSIONS:

In children, live attenuated influenza vaccine provided sustained protection against influenza illness caused by antigenically similar strains. Efficacy at 1 to <5 months postvaccination was comparable to that at 9-12 months for A/H1N1 and A/H3N2 strains and at 5-7 months for B strains. Meaningful efficacy was seen through a second season without revaccination, although at a lower level than during the first 12 months postvaccination.

PMID:
18600188
[PubMed - indexed for MEDLINE]
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