Prevalence of influenza A (H1N1) seropositivity in unvaccinated healthcare workers in Scotland at the height of the global pandemic

Kate Smith, Pamela Warner, Linda J Williams, Walt E Adamson, S Vittal Katikireddi, Paul Dewart, William F Carman, Kate Templeton, Fiona C Denison, D Graham Mackenzie

Research output: Contribution to journalArticlepeer-review

Abstract

We set out to identify the level of previous exposure to influenza A (H1N1) in unvaccinated healthcare workers (HCWs) at the peak of the pandemic outbreak in the UK, with control samples collected prior to the outbreak.
METHODS:
Cross-sectional study (seroprevalence assessed before and at pandemic peak, with questionnaire data collected at peak of outbreak) in HCWs in Scotland.
RESULTS:
The prevalence of seropositivity in 493 HCWs at pandemic peak was 10.3%, which was higher than the prepandemic level by 3.7 percentage points (95% CI 0.3% to 7.3%, P = 0.048). Seropositivity rates for frontline and nonfrontline HCWs were similar.
CONCLUSION:
At pandemic peak, only 10.3% of HCWs were seropositive for influenza A (H1N1), so the great majority were still susceptible to infection at the introduction of the vaccination programme. Few studies have reported on seroprevalence in unvaccinated and asymptomatic participants, so our findings may have relevance to the wider population.
Original languageEnglish
Article number407505
JournalJournal of Environmental and Public Health
Volume2011
DOIs
Publication statusPublished - 2011

Keywords

  • Adolescent
  • Adult
  • Aged
  • Antibodies, Viral
  • Cross-Sectional Studies
  • Health Personnel
  • Humans
  • Influenza A Virus, H1N1 Subtype
  • Influenza, Human
  • Logistic regression
  • Middle Aged
  • pandemic
  • PREVALENCE
  • SCOTLAND
  • Seroepidemiologic Studies
  • VACCINATION
  • Young Adult

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