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Vaccine. 2015 Aug 10. pii: S0264-410X(15)01102-0. doi: 10.1016/j.vaccine.2015.07.098. [Epub ahead of print]
Incidence of medically attended influenza infection and cases averted by vaccination, 2011/2012 and 2012/2013 influenza seasons.
Jackson ML1, Jackson LA2, Kieke B3, McClure D3, Gaglani M4, Murthy K4, Malosh R5, Monto A5, Zimmerman RK6, Foppa IM7, Flannery B8, Thompson MG8.
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Abstract
BACKGROUND:
We estimated the burden of outpatient influenza and cases prevented by vaccination during the 2011/2012 and 2012/2013 influenza seasons using data from the United States Influenza Vaccine Effectiveness (US Flu VE) Network.
METHODS:
We defined source populations of persons who could seek care for acute respiratory illness (ARI) at each of the five US Flu VE Network sites. We identified all members of the source population who were tested for influenza during US Flu VE influenza surveillance. Each influenza-positive subject received a sampling weight based on the proportion of source population members who were tested for influenza, stratified by site, age, and other factors. We used the sampling weights to estimate the cumulative incidence of medically attended influenza in the source populations. We estimated cases averted by vaccination using estimates of cumulative incidence, vaccine coverage, and vaccine effectiveness.
RESULTS:
Cumulative incidence of medically attended influenza ranged from 0.8% to 2.8% across sites during 2011/2012 and from 2.6% to 6.5% during the 2012/2013 season. Stratified by age, incidence ranged from 1.2% among adults 50 years of age and older in 2011/2012 to 10.9% among children 6 months to 8 years of age in 2012/2013. Cases averted by vaccination ranged from 4 to 41 per 1000 vaccinees, depending on the study site and year.
CONCLUSIONS:
The incidence of medically attended influenza varies greatly by year and even by geographic region within the same year. The number of cases averted by vaccination varies greatly based on overall incidence and on vaccine coverage.
Copyright ? 2015. Published by Elsevier Ltd.
KEYWORDS:
Human; Incidence; Influenza; Influenza vaccines
PMID: 26271827 [PubMed - as supplied by publisher]
Incidence of medically attended influenza infection and cases averted by vaccination, 2011/2012 and 2012/2013 influenza seasons.
Jackson ML1, Jackson LA2, Kieke B3, McClure D3, Gaglani M4, Murthy K4, Malosh R5, Monto A5, Zimmerman RK6, Foppa IM7, Flannery B8, Thompson MG8.
Author information
Abstract
BACKGROUND:
We estimated the burden of outpatient influenza and cases prevented by vaccination during the 2011/2012 and 2012/2013 influenza seasons using data from the United States Influenza Vaccine Effectiveness (US Flu VE) Network.
METHODS:
We defined source populations of persons who could seek care for acute respiratory illness (ARI) at each of the five US Flu VE Network sites. We identified all members of the source population who were tested for influenza during US Flu VE influenza surveillance. Each influenza-positive subject received a sampling weight based on the proportion of source population members who were tested for influenza, stratified by site, age, and other factors. We used the sampling weights to estimate the cumulative incidence of medically attended influenza in the source populations. We estimated cases averted by vaccination using estimates of cumulative incidence, vaccine coverage, and vaccine effectiveness.
RESULTS:
Cumulative incidence of medically attended influenza ranged from 0.8% to 2.8% across sites during 2011/2012 and from 2.6% to 6.5% during the 2012/2013 season. Stratified by age, incidence ranged from 1.2% among adults 50 years of age and older in 2011/2012 to 10.9% among children 6 months to 8 years of age in 2012/2013. Cases averted by vaccination ranged from 4 to 41 per 1000 vaccinees, depending on the study site and year.
CONCLUSIONS:
The incidence of medically attended influenza varies greatly by year and even by geographic region within the same year. The number of cases averted by vaccination varies greatly based on overall incidence and on vaccine coverage.
Copyright ? 2015. Published by Elsevier Ltd.
KEYWORDS:
Human; Incidence; Influenza; Influenza vaccines
PMID: 26271827 [PubMed - as supplied by publisher]