A Systematic Review of Studies of the Effect of Influenza Vaccine Against Mismatched Strains
The purpose of this study is to consolidate the cross-protection offered by influenza vaccines against circulating influenza A or B viruses that are not antigenically well-matched to vaccine strains and to determine the degree of cross-protection separately for influenza A and influenza B, through a systematic review of the literature.
|Official Title:||Effect of Influenza Vaccine Against Mismatched Strains: Systematic Review|
- Incidence of laboratory-confirmed influenza [Polymerase Chain Reaction (PCR) or viral culture]. [ Designated as safety issue: No ]
- Incidence of laboratory-confirmed influenza through antibody assay (a less sensitive test than PCR or viral culture), alone or combined with PCR, and/or viral culture. [ Designated as safety issue: No ]
|Study Start Date:||August 2011|
|Study Completion Date:||December 2011|
|Primary Completion Date:||December 2011 (Final data collection date for primary outcome measure)|
Unadjuvanted, monovalent, and trivalent vaccines, and vaccines delivered intramuscularly, intradermally, or intranasally, depending on what is found in the included studies.
The research question of this project is: "what is the cross-protection afforded by vaccination (using an LAIV, TIV, or other type of vaccine) against influenza A or B and their subtypes and lineages?" The Preferred Reporting Items for Systematic Reviews and Meta-analyses (PRISMA) Statement will be used to guide the reporting of this review. Studies reporting cross-protection data after vaccination with approved formulations of influenza vaccines with influenza A or B will be included. Inclusion will not be limited by publication status, or year of dissemination but will be limited to randomized clinical trials (RCTs) and quasi-RCTs comparing influenza vaccine(s) with placebo. Only RCTs written in English will be included. A meta-analysis will be conducted if there is sufficient data.