title: Adenovirus respiratory infections in hospitalized children: clinical findings in relation to species and serotypes.
abstract: BACKGROUND
  There are >50 adenovirus (ADV) serotypes that are divided into 7 species (A-G). The aim of this study was to characterize ADV serotypes and species in hospitalized infants and children in the City of Zagreb and Zagreb County and to describe clinical features and laboratory findings of ADV infections according to the causative ADV serotype.
  
  
  METHODS
  During the 3-year period from January 2006 to November 2008, 135 children (<10 years of age) with ADV respiratory infection, based on virus isolation, were treated at 2 hospitals in Zagreb. Demographics, clinical presentations and laboratory findings were evaluated.
  
  
  RESULTS
  Of the 135 ADV isolates, 77 (57.0%) were type 2, followed by 26 (19.3%) of type 1, 15 (11.1%) isolates of type 3, 2 (1.5%) of type 6 and only 1 (0.7%) was type 7. Male-to-female ratio was 3.2:1 (103 boys and 32 girls). The mean age was 22.9 months. The most common symptoms were fever (98%), rhinorrhea (89%) and cough (71%). The mean peak body temperature was 39.8°C. Tonsillitis was present in 79 (59%) and acute otitis media in 37 (28%) patients. Leukocytosis (>15.0×10⁹/L) was noted in 103 (77%) patients. Serum C-reactive protein was >40 mg/L in 74 patients (56%). The erythrocyte sedimentation rate was ≥30 mm/h in 91 (71%) of the 127 patients tested.
  
  
  CONCLUSIONS
  In this study, the most common isolated serotype was ADV type 2. Most affected children were younger than 3 years. ADV infections in young children can present with prolonged fever, leukocytosis and significantly elevated C-reactive protein and erythrocyte sedimentation rate, mimicking bacterial infections.
authors.affiliation: Department of Virology, Croatian National Institute of Public Health, Zagreb, Croatia. itabain@gmail.com
authors.forename: Irena
authors.initials: I
authors.lastname: Tabain
authors.forename: Sunčanica
authors.initials: S
authors.lastname: Ljubin-Sternak
authors.forename: Jasna
authors.initials: J
authors.lastname: Cepin-Bogović
authors.forename: Leo
authors.initials: L
authors.lastname: Markovinović
authors.forename: Ivica
authors.initials: I
authors.lastname: Knezović
authors.forename: Gordana
authors.initials: G
authors.lastname: Mlinarić-Galinović
mesh_terms: D000257:Adenoviridae Infections / Q000453:epidemiology* / Q000473:pathology; D000260:Adenoviruses, Human / Q000145:classification / Q000235:genetics / Q000302:isolation & purification*; D002648:Child; D002673:Child, Hospitalized; D002675:Child, Preschool; D017523:Croatia / Q000453:epidemiology; D005260:Female; D006801:Humans; D007223:Infant; D008297:Male; D015995:Prevalence; D012141:Respiratory Tract Infections / Q000453:epidemiology* / Q000473:pathology / Q000821:virology*