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Korean J Pediatr 2011 August;54(8) :329-334.
Clinical characteristics and outcomes among pediatric patients hospitalized with pandemic influenza A/H1N1 2009 infection
Eun Lee (Lee E)1, Ju-Hee Seo (Seo JH), Hyung-Young Kim (Kim HY), Shin Na (Na S)3, Sung-Han Kim (Kim SH)3, Ji-Won Kwon (Kwon JW)4, Byoung-Ju Kim (Kim BJ)5, Soo-Jong Hong (Hong SJ)
Department of Pediatrics, Childhood Asthma Atopy Center, Asan Medical Center Children`s Hospital, Seoul, Korea
1Department of Pediatrics, Asan Medical Center Children`s Hospital, Seoul, Korea
3Department of Infectious Diseases, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
4Department of Pediatrics, Seoul National University Bundang Hospital, Seongnam, Korea
5Department of Pediatrics, Inje University Haeundae Paik Hospital, Busan, Korea
Corresponding Author: Soo-Jong Hong ,Tel: +82-2-3010-3379, Fax: +82-2-473-3725, Email:
Copyright © 2011 by The Korean Pediatric Society
Purpose : The purpose of this article is to describe the clinical and epidemiologic features and outcomes among children hospitalized with pandemic influenza A/H1N1 2009 infection. Methods : We retrospectively reviewed the charts of hospitalized pediatric patients (<18 years) diagnosed with pandemic influenza A/H1N1 2009 infection by reverse-transcriptase polymerase chain reaction at a tertiary hospital in Seoul, Korea, between September 2009 and February 2010. Results : A total of 72 children were hospitalized with pandemic influenza A/H1N1 2009 infection (median age, 6.0 years; range, 2 months to 18 years). A total of 40% had at least 1 underlying medical condition, including asthma (17%), malignancies (19%), and heart diseases (17%). Of the 72 patients, 54 (76%) children admitted with H1N1 infection showed radiographic alterations compatible with pneumonia. There was no significant difference in pre-existing conditions between pandemic influenza A/H1N1 infected patients with or without pneumonia. Children with pandemic influenza A/ H1N1 pneumonia were more likely to have a lower lymphocyte ratio (P=0.02), higher platelet count (P=0.02), and higher level of serum glucose (P=0.003), and more commonly presented with dyspnea than did those without pneumonia (P=0.04). Conclusion : No significant differences in age, sex, or presence of preexisting conditions were found between children hospitalized with pandemic influenza A/H1N1 H1N1 influenza infection with pneumonia and those without pneumonia. Higher leukocyte count, higher glucose level, and a lower lymphocyte ratio were associated with the development of pandemic A/H1N1 2009 influenza pneumonia.
Keywords: H1N1 | Pneumonia | Children | Hospitalization
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