Incidence of pandemic (H1N1) 2009 influenza infection in children and pregnant women during the 2009 influenza season in Western Australia - a seroprevalence study

Abstract

OBJECTIVE: To determine antibody levels and estimate incidence of infection with pandemic (H1N1) 2009 influenza in children and pregnant women during the 2009 winter in Western Australia. DESIGN, SETTING AND PARTICIPANTS: Two cross-sectional serosurveys using stored specimens collected for unrelated pathology testing, from before and after (3 August to 30 November 2009) circulation of the pandemic virus, and before commencement of the pandemic vaccination program. Specimens were from three groups: children aged 1-4 years, older children and teenagers aged 5-19 years, and pregnant women aged 21-45 years. The groups were geographically representative of the WA population. MAIN OUTCOME MEASURES..