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Effectiveness of seasonal influenza vaccine in preventing influenza primary care visits and hospitalisation in Auckland, New Zealand in 2015: interim estimates

Abstract

Seasonal influenza vaccines are used widely to reduce the burden of influenza, but effectiveness measures vary by a range of factors including season, age and underlying co-morbidities [1,2]. The Southern Hemisphere Influenza and Vaccine Effectiveness, Research and Surveillance (SHIVERS) study [3], running since 2012, allows estimation of vaccine effectiveness (VE) against patients presenting with influenza illness to general practice (primary care) and against influenza requiring hospitalisation. Reports were published for 2012, 2013 and 2014 [4–6]. Here we report the preliminary VE results for the 2015 influenza season in New Zealand.

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