Journal
EMERGING INFECTIOUS DISEASES
Volume 19, Issue 1, Pages 92-101Publisher
CENTERS DISEASE CONTROL & PREVENTION
DOI: 10.3201/eid1901.111643
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- Communicable Disease and Surveillance Branch of the Office of Health Protection, Department of Health and Ageing, Commonwealth of Australia
- World Health Organization Collaborating Centre for Reference and Research on Influenza, North Melbourne, Victoria
- Centre for Infectious Diseases and Microbiology Laboratory Services, Institute of Clinical Pathology and Medical Research, Westmead Hospital, Sydney
- Western Diagnostic Pathology, Darwin
- National University of Singapore
- Singapore Ministry of Health
- Singapore Armed Forces
- Defence Science Organization National Laboratories, Singapore
- Tan Tock Seng Hospital, Singapore
- Kandang Kerbau Hospital, Singapore
- Australian Government Department of Health and Ageing
- New Zealand Ministry of Health
- National Medical Research Council of Singapore
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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.
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