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Type: Journal article
Title: Clinical epidemiology and predictors of outcome in children hospitalised with influenza A(H1N1)pdm09 in 2009: a prospective national study
Author: Khandaker, G.
Zurynski, Y.
Ridley, G.
Buttery, J.
Marshall, H.
Richmond, P.
Royle, J.
Gold, M.
Walls, T.
Whitehead, B.
McIntyre, P.
Wood, N.
Booy, R.
Elliott, E.
Citation: Influenza and Other Respiratory Viruses, 2014; 8(6):636-645
Publisher: John Wiley & Sons
Issue Date: 2014
ISSN: 1750-2640
Statement of
Gulam Khandaker, Yvonne Zurynski, Greta Ridley, Jim Buttery, Helen Marshall, Peter C. Richmond, Jenny Royle, Michael Gold, Tony Walls, Bruce Whitehead, Peter McIntyre, Nicholas Wood, Robert Booy, Elizabeth J. Elliott
Abstract: BACKGROUND: There are few large-scale, prospective studies of influenza A(H1N1)pdm09 in children that identify predictors of adverse outcomes. OBJECTIVES: We aimed to examine clinical epidemiology and predictors for adverse outcomes in children hospitalised with influenza A(H1N1)pdm09 in Australia. METHODS: Active hospital surveillance in six tertiary paediatric referral centres (June-September, 2009). All children aged <15 years admitted with laboratory-confirmed influenza A(H1N1)pdm09 were studied. RESULTS: Of 601 children admitted with laboratory-confirmed influenza, 506 (84·2%) had influenza A(H1N1)pdm09. Half (51·0%) of children with influenza A(H1N1)pdm09 were previously healthy. Hospital stay was longer in children with pre-existing condition (mean 6·9 versus 4·9 days; P = 0·02) as was paediatric intensive care unit (PICU) stay (7·0 versus 2·3 days; P = 0·005). Rapid diagnosis decreased both antibiotic use and length of hospital and PICU stay. Fifty (9·9%) children were admitted to a PICU, 30 (5·9%) required mechanical ventilation and 5 (0·9%) died. Laboratory-proven bacterial co-infection and chronic lung disease were significant independent predictors of PICU admission (OR 6·89, 95% CI 3·15-15·06 and OR 3·58, 95% CI 1·41-9·07, respectively) and requirement for ventilation (OR 5·61, 95% CI 2·2-14·28 and OR 5·18, 95% CI 1·8-14·86, respectively). Chronic neurological disease was a predictor of admission to PICU (OR 2·30, 95% CI 1·14-4·61). CONCLUSIONS: During the 2009 pandemic, influenza was a major cause of hospitalisation in tertiary paediatric hospitals. Co-infection and underlying chronic disease increased risk of PICU admission and/or ventilation. Half the children admitted were previously healthy, supporting a role for universal influenza vaccination in children.
Keywords: Children; influenza; influenza A(H1N1)pdm09; outcome; pandemic
Description: Article first published online: 26 SEP 2014
Rights: © 2014 The Authors. Influenza and Other Respiratory Viruses Published by John Wiley & Sons Ltd.
DOI: 10.1111/irv.12286
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Paediatrics publications

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