Seroepidemiologic effects of influenza A(H1N1)pdm09 in Australia, New Zealand, and Singapore

the Australia, New Zealand and Singapore Pandemic Serosurveillance Study Group

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Abstract

To estimate population attack rates of influenza A(H1N1)pdm2009 in the Southern Hemisphere during June-August 2009, we conducted several serologic studies. We pooled individual-level data from studies using hemagglutination inhibition assays performed in Australia, New Zealand, and Singapore. We determined seropositive proportions (titer >40) for each study region by age-group and sex in pre- and postpandemic phases, as defined by jurisdictional notification data. After exclusions, the pooled database consisted of, 4,414 prepandemic assays and 7,715 postpandemic assays. In the prepandemic phase, older age groups showed greater seropositive proportions, with age-standardized, community-based proportions ranging from 3.5% in Singapore to 11.9% in New Zealand. In the postpandemic phase, seropositive proportions ranged from 17.5% in Singapore to 30.8% in New Zealand, with highest proportions seen in school-aged children. Pregnancy and residential care were associated with lower postpandemic seropositivity, whereas Aboriginal and Torres Strait Islander Australians and Pacific Peoples of New Zealand had greater postpandemic seropositivity.

Original languageEnglish
Pages (from-to)92-101
Number of pages10
JournalEmerging Infectious Diseases
Volume19
Issue number1
DOIs
Publication statusPublished - Jan 2013
Externally publishedYes

Cite this

the Australia, New Zealand and Singapore Pandemic Serosurveillance Study Group (2013). Seroepidemiologic effects of influenza A(H1N1)pdm09 in Australia, New Zealand, and Singapore. Emerging Infectious Diseases, 19(1), 92-101. https://doi.org/10.3201/eid1901.111643