tetano
Editor, Senior Moderator
PLoS One. 2013 Apr 30;8(4):e63156. doi: 10.1371/journal.pone.0063156. Print 2013.
Effectiveness of MF59? Adjuvanted Influenza A(H1N1)pdm09 Vaccine in Risk Groups in the Netherlands.
Wijnans L, Dieleman J, Voordouw B, Sturkenboom M.
Source
Erasmus Medical Center, Rotterdam, The Netherlands ; Medicines Evaluation Board, Utrecht, The Netherlands.
Abstract
BACKGROUND:
The aim of the present study was to estimate the effectiveness of the MF59?-adjuvanted influenza A(H1N1)pdm09 vaccine against medically attended influenza-like illness and RT-PCR confirmed influenza in the at-risk population and persons over 60 in the Netherlands.
METHODS:
We conducted a retrospective cohort study in a Dutch based GP medical record database between 30 November 2009 and 1 March 2010 to estimate the vaccine effectiveness against influenza-like illness. Within the cohort we nested a test negative case-control study to estimate the effectiveness against laboratory confirmed influenza.
RESULTS:
The crude effectiveness in preventing diagnosed or possible influenza-like illness was 17.3% (95%CI: -8.5%-36.9%). Of the measured covariates, age, the severity of disease and health seeking behaviour through devised proxies confounded the association between vaccination and influenza-like illness. The adjusted vaccine effectiveness was 20.8% (95%CI: -5.4%, 40.5%) and varied significantly by age, being highest in adults up to 50 years (59%, 95%CI: 23%, 78%), and non-detectable in adults over 50 years. The number of cases in the nested case control study was too limited to validly estimate the VE against confirmed influenza.
CONCLUSIONS:
With our study we demonstrated that the approach of combining a cohort study in a primary health care database with field sampling is a feasible and useful option to monitor VE of influenza vaccines in the future.
PMID:
23646191
[PubMed - in process]
http://www.ncbi.nlm.nih.gov/pubmed/23646191
Effectiveness of MF59? Adjuvanted Influenza A(H1N1)pdm09 Vaccine in Risk Groups in the Netherlands.
Wijnans L, Dieleman J, Voordouw B, Sturkenboom M.
Source
Erasmus Medical Center, Rotterdam, The Netherlands ; Medicines Evaluation Board, Utrecht, The Netherlands.
Abstract
BACKGROUND:
The aim of the present study was to estimate the effectiveness of the MF59?-adjuvanted influenza A(H1N1)pdm09 vaccine against medically attended influenza-like illness and RT-PCR confirmed influenza in the at-risk population and persons over 60 in the Netherlands.
METHODS:
We conducted a retrospective cohort study in a Dutch based GP medical record database between 30 November 2009 and 1 March 2010 to estimate the vaccine effectiveness against influenza-like illness. Within the cohort we nested a test negative case-control study to estimate the effectiveness against laboratory confirmed influenza.
RESULTS:
The crude effectiveness in preventing diagnosed or possible influenza-like illness was 17.3% (95%CI: -8.5%-36.9%). Of the measured covariates, age, the severity of disease and health seeking behaviour through devised proxies confounded the association between vaccination and influenza-like illness. The adjusted vaccine effectiveness was 20.8% (95%CI: -5.4%, 40.5%) and varied significantly by age, being highest in adults up to 50 years (59%, 95%CI: 23%, 78%), and non-detectable in adults over 50 years. The number of cases in the nested case control study was too limited to validly estimate the VE against confirmed influenza.
CONCLUSIONS:
With our study we demonstrated that the approach of combining a cohort study in a primary health care database with field sampling is a feasible and useful option to monitor VE of influenza vaccines in the future.
PMID:
23646191
[PubMed - in process]
http://www.ncbi.nlm.nih.gov/pubmed/23646191