title: Clinical factors associated with severity in hospitalized children infected with avian influenza (H5N1).
abstract: OBJECTIVE
  The World Health organization received reports of 478 laboratory-confirmed cases of influenza A (H5N1) from 15 countries between November 2003 and February 2010. More than 50% of these cases involved patients <20 years of age. Determining an association between the clinical factors at the time of hospital admission and prognosis may be useful for timely and adequate consultation and treatment. It has been difficult to obtain these clinical factors adjusted with other confounding factors, such as age and sex, as published studies of H5N1 virus infection usually reported only a few cases. So, we performed a pooled analysis of the reported cases.
  
  
  METHODS
  Five case reports (36 patients <18 years of age) of H5N1 infection from four countries published between 2004 and 2009 were assessed based on available individual clinical data. Using the pooled data for all patients, we investigated the associations between patients' prognosis and available laboratory findings, such as white blood cell (WBC) counts, platelet (PLT) counts, and serum levels of aspartate aminotransferase (AST) and alanine aminotransferase (ALT) by adjusting for age and/or sex.
  
  
  RESULTS
  The linear regression analysis revealed that mortality was negatively associated with WBC and PLT counts adjusted with age and sex. Increased log AST tended to be associated with a poor prognosis (p = 0.054), but there was no significant association between survival and log ALT level.
  
  
  CONCLUSIONS
  Both decreased WBC and PLT counts can be considered to be common predictors of poor prognosis in H5N1 influenza patients <18 years of age. Further studies are needed for clarification.
authors: Center for Molecular Prevention and Environmental Medicine, Basic Clinical Science and Public Health, Tokai University School of Medicine, Isehara, Kanagawa, 259-1193, Japan. furuya@is.icc.u-tokai.ac.jp
authors: Hiroyuki
authors: H
authors: Furuya
authors: Shoji
authors: S
authors: Kawachi
authors: Mika
authors: M
authors: Shigematsu
authors: Kazuo
authors: K
authors: Suzuki
authors: Tetsu
authors: T
authors: Watanabe
mesh_terms: D000293:Adolescent; D000367:Age Factors; D000410:Alanine Transaminase / Q000097:blood; D001210:Asia, Southeastern / Q000453:epidemiology; D001219:Aspartate Aminotransferases / Q000097:blood; D002648:Child; D002675:Child, Preschool; D005260:Female; D006760:Hospitalization; D006801:Humans; D053124:Influenza A Virus, H5N1 Subtype / Q000302:isolation & purification*; D007251:Influenza, Human / Q000097:blood / Q000401:mortality / Q000503:physiopathology* / Q000821:virology; D007958:Leukocyte Count; D008297:Male; D010976:Platelet Count; D011379:Prognosis; D012189:Retrospective Studies; D012737:Sex Factors; D014421:Turkey / Q000453:epidemiology
chemical_list: D001219:Aspartate Aminotransferases; D000410:Alanine Transaminase