The disease spectrum associated with human bocavirus-1 infection remains to be fully defined. We report a case of bocavirus-1-associated bronchiolitis, leading to severe respiratory failure and extracorporeal membrane oxygenation in a 4-year-old child, and suggest blood testing for human bocavirus-1 in children with severe respiratory tract infection.
CASE REPORTT he patient was a 4-year-old girl, prematurely born in gestational week 29. She had an ordinary upbringing with mild infection-associated wheezing and was hospitalized once at 1 year of age for wheezing. She had no continuous medication but was prescribed albuterol inhalation as needed. The disease episode started rather suddenly with mild dyspnea. Albuterol inhalation gave no amelioration, and this prompted two outpatient visits to the emergency ward of the local hospital on the first 2 days of the disease. Fever (38.2°C) was noted, and she was given albuterol and budesonide inhalations and oral (p.o.) penicillin V with moderate effect. During the second night of the disease, her respiration deteriorated with heavy dyspnea and wheezing, and she returned to the hospital for a third time. Because of severe airway constriction she was now referred to a pediatrics clinic in a secondary hospital. A chest X-ray showed subcutaneous emphysema, pneumomediastinum, and left-sided pneumothorax, which are known complications of severe wheezing in children (5), as well as bilateral minor infiltrates. She was given intravenous (i.v.) cefotaxime and erythromycin. Tracheal intubation was performed and bilateral chest tubes were inserted without an improvement in oxygen saturation. Ventilating the patient was problematic, requiring a peak inspiratory pressure up to 55 cm H 2 O to maintain tidal volumes of 9 ml/kg. At this point the patient had a partial CO 2 pressure (pCO 2 ) of 11.0 kPa (82 mm Hg), and the extracorporeal membrane oxygenation (ECMO) unit at Karolinska University Hospital was contacted. The patient was cannulated for venovenous (VV)-ECMO (15F double-lumen Origen cannulae) locally and transferred to Karolinska in Stockholm. The patient was stabilized, but the ECMO treatment was complicated by cannula perforation of the right atrium and an acute thoracotomy had to be performed. Her respiration improved gradually over the following days. She could be removed from ECMO support after 2 days and extubated after 5 days. The girl made a full recovery and was healthy on follow-up.At the start of ECMO treatment, plasma C-reactive protein was 37 mg/liter and the white blood cell count was 8.0 ϫ 10 9 /liter. Bacterial and fungal cultures from tracheal aspirate, urine, and blood collected on the first and second day of ECMO treatment were negative, including cultures for Legionella pneumophila (tracheal aspirate) and Bordetella pertussis (nasopharyngeal swab). However, the samples were obtained after initiation of antibiotic therapy. An immunofluorescence test for respiratory syncytial virus (RSV) on a nasopharyngeal sample made at the secondary hospital was negative...