Effectiveness of seasonal influenza vaccine in preventing laboratory-confirmed influenza in primary care in the United Kingdom: 2015/16 mid-season results

Author:

Pebody Richard1,Warburton Fiona1,Ellis Joanna1,Andrews Nick1,Potts Alison2,Cottrell Simon3,Johnston Jillian4,Reynolds Arlene2,Gunson Rory5,Thompson Catherine1,Galiano Monica1,Robertson Chris6,Mullett David7,Gallagher Naomh4,Sinnathamby Mary1,Yonova Ivelina78,Moore Catherine3,McMenamin Jim2,de Lusignan Simon78,Zambon Maria1

Affiliation:

1. Public Health England, London, United Kingdom

2. Health Protection Scotland, Glasgow, United Kingdom

3. Public Health Wales, Cardiff, United Kingdom

4. Public Health Agency Northern Ireland, Belfast, United Kingdom

5. West of Scotland Specialist Virology Centre, Glasgow, United Kingdom

6. University of Strathclyde, Glasgow, United Kingdom

7. University of Surrey, Guildford, United Kingdom

8. Royal College of General Practitioners, Research and Surveillance Centre, London, United Kingdom

Abstract

In 2015/16, the influenza season in the United Kingdom was dominated by influenza A(H1N1)pdm09 circulation. Virus characterisation indicated the emergence of genetic clusters, with the majority antigenically similar to the current influenza A(H1N1)pdm09 vaccine strain. Mid-season vaccine effectiveness (VE) estimates show an adjusted VE of 41.5% (95% confidence interval (CI): 3.0–64.7) against influenza-confirmed primary care consultations and of 49.1% (95% CI: 9.3–71.5) against influenza A(H1N1)pdm09. These estimates show levels of protection similar to the 2010/11 season, when this strain was first used in the seasonal vaccine.

Publisher

European Centre for Disease Control and Prevention (ECDC)

Subject

Virology,Public Health, Environmental and Occupational Health,Epidemiology

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