Pandemic and seasonal vaccine coverage and effectiveness during the 2009–2010 pandemic influenza in an Italian adult population
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- Costanzo, S., Gianfagna, F., Persichillo, M. et al. Int J Public Health (2012) 57: 569. doi:10.1007/s00038-012-0346-0
To evaluate the response to pandemic vaccination and seasonal and pandemic vaccine effectiveness (VE) in an Italian adult population, during the 2009–2010 influenza season.
Data were recorded by interviewing 19,275 subjects (≥35 years), randomly recruited from the general population of the Moli-sani project. Events [influenza-like illness (ILI), hospitalization and death], which had occurred between 1 November 2009 and 31 January 2010 were considered. VE was analyzed by multivariable Poisson regression analysis.
Pandemic vaccine coverage was very low (2.4%) in subjects at high-flu risk, aged 35–65 years (N = 8,048); there was no significant preventive effect of vaccine against ILI.
Seasonal vaccine coverage was 26.6% in the whole population (63% in elderly and 21.9% in middle-aged subjects at high-flu risk). There was a higher risk to develop ILI in middle-age [VE: −17% (95% CI: −35,−1)] or at high flu-risk [VE: −17% (95% CI: −39, 2)] vaccinated groups.
Coverage of pandemic vaccine was very low in a Southern Italy population, with no protective effect against ILI.