Outbreak of 2009 pandemic influenza A(H1N1) in a Finnish garrison - a serological survey

M Aho; O Lyytikaïnen; J E Nyholm; T Kuitunen; E Rönkkö; R Santanen; T Ziegler; S Nikkari

doi:10.2807/ese.15.45.19709-en

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Outbreak of 2009 pandemic influenza A(H1N1) in a Finnish garrison - a serological survey
M Aho¹ , O Lyytikaïnen² , J E Nyholm³ , T Kuitunen¹ , E Rönkkö² , R Santanen² , T Ziegler² , S Nikkari¹
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Affiliations: ¹ Centre for Military Medicine, Research and Development Department, Helsinki, Finland ² National Institute for Health and Welfare, Helsinki, Finland ³ Centre for Military Medicine, Primary Health Care Services, Raasepori, Finland

Correspondence:
S Nikkari
simo.nikkari mil.fi
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Citation style for this article: Aho M, Lyytikaïnen O, Nyholm J E, Kuitunen T, Rönkkö E, Santanen R, Ziegler T, Nikkari S. Outbreak of 2009 pandemic influenza A(H1N1) in a Finnish garrison - a serological survey. Euro Surveill. 2010;15(45):pii=19709. https://doi.org/10.2807/ese.15.45.19709-en Received: 29 Apr 2010

Abstract

In September 2009, an outbreak of 2009 pandemic influenza A(H1N1) took place in a Finnish garrison. In November 2009, we performed a serological survey among 984 recruits undergoing their military service at the garrison and related the results to self-reported upper respiratory tract infection (URTI) with or without fever. Of 346 volunteers who donated a blood sample, 169 (49%) had pandemic influenza A(H1N1) virus-specific antibodies. Of those, 84 (50%) reported no recent history of URTI, suggesting that a major part of those infected with pandemic influenza A(H1N1) virus may be asymptomatic.