Abstract
To rapidly describe the epidemiology of influenza-like illness (ILI) during the 2009 winter epidemic of pandemic (H1N1) 2009 virus in New South Wales, Australia, we used results of a continuous population health survey. During July-September 2009, ILI was experienced by 23% of the population. Among these persons, 51% were unable to undertake normal duties for <3 days, 55% sought care at a general practice, and 5% went to a hospital. Factors independently associated with ILI were younger age, daily smoking, and obesity. Effectiveness of prepandemic seasonal vaccine was ?20%. The high prevalence of risk factors associated with a substantially increased risk for ILI deserves greater recognition.
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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Adolescent
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Adult
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Aged
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Child
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Child, Preschool
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Diagnosis, Differential
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Female
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Health Surveys
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Humans
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Incidence
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Infant
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Infant, Newborn
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Influenza A Virus, H1N1 Subtype / physiology
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Influenza, Human / diagnosis
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Influenza, Human / epidemiology
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Influenza, Human / prevention & control*
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Influenza, Human / virology
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Middle Aged
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New South Wales / epidemiology
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Pandemics / prevention & control
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Patient Acceptance of Health Care
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Population Surveillance
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RNA Virus Infections / diagnosis
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RNA Virus Infections / epidemiology
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RNA Virus Infections / prevention & control*
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RNA Virus Infections / virology
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Risk Factors
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Seasons
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Severity of Illness Index
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Treatment Outcome
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Vaccination*