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Background: The 2009 pandemic influenza A (H1N1) (PIA) virus infected large parts of the pediatric population with a wide clinical spectrum and an initially unknown complication rate. The aims of our study were to define clinical characteristics and outcome of pandemic influenza A (H1N1) 2009-associated hospitalizations (PIAH) in children <18 years of age. All hospitalized cases of children <18 years of age with laboratory-confirmed pandemic influenza A (H1N1) 2009 in the region of Wuerzburg (Northern Bavaria, Germany) between July 2009 and March 2010 were identified. For these children a medical chart review was performed to determine their clinical characteristics and complications. Results: Between July 2009 and March 2010, 94 PIAH (62% males) occurred in children <18 years of age, with a median age of 7 years (IQR: 3–12 years). Underlying diseases and predisposing factors were documented in 40 (43%) children; obesity (n = 12, 30%), asthma (n = 10, 25%) and neurologic disorders (n = 8, 20%) were most frequently reported. Sixteen (17%) children received oxygen supplementation; three (3%) children required mechanical ventilation. Six (6%) children were admitted to an intensive care unit, four of them with underlying chronic diseases. Conclusions: Most PIAH demonstrated a benign course of disease. However, six children (6%) needed treatment at an intensive care unit for severe complications.
Influenza-assoziierte Atemwegserkrankungen führen jedes Jahr zu zahlreichen Hospitalisierungen und Todesfällen. Der während der Pandemie 2009 zirkulierende Erreger Influenza A(H1N1)pdm09 führte zu zahlreichen, zum Teil schweren Komplikationen, insbesondere auch bei jüngeren Erwachsenen. In der vorliegenden Studie wurden Influenza-assoziierte Hospitalisierungen (IAH) hinsichtlich Krankheitsverlauf in den verschiedenen Altersgruppen sowie bei verschiedenen Erregern untersucht. Zudem erfolgte eine Analyse der direkten Krankheitskosten.
Einen besonders schweren Verlauf zeigten Erwachsene mit Grunderkrankung zwischen 18-60 Jahren, die überwiegend mit dem Erreger Influenza A(H1N1)pdm09 infiziert waren. Ebenso waren schwangeren Patientinnen mit IAH mit dem Erreger A(H1N1)pdm09 selten, aber schwer betroffen.
Bei Patienten von 18-60 Jahren mit dem Erreger Influenza A(H1N1)pdm09 entstanden die höchsten direkten Kosten im Vergleich zu den anderen Altersgruppen.