A child with soft-tissue infection and lymphadenitis.

We report a case of a soft-tissue infection with Francisella philomiragia, a rare opportunistic pathogen in individuals with chronic granulomatous disease.

Fatal human metapneumovirus infection following allogeneic hematopoietic stem cell transplantation.

Respiratory viruses are an important yet underestimated cause of infectious morbidity and mortality in immunocompromised children and adolescents. Here, we report the occurrence of fatal lower respiratory tract disease associated with human metapneumovirus (HMPV) infection in a 10-year-old girl with chronic graft-versus-host disease following allogeneic hematopoietic stem cell transplantation (HSCT) for secondary chronic myeloid leukemia. Symptoms occurred 8 months after HSCT while on immunosuppression with 0.2 mg/kg/day of prednisone, and presented as dry cough, bilateral pneumonitis, and progressive respiratory distress. Non-invasive and invasive microbiological investigations revealed HMPV type B as the sole pathogen. Histopathological findings showed interstitial and intra-alveolar pneumonitis with profound alveolar cell damage. The patient was treated with intravenous and oral ribavirin and polyvalent immunoglobulins, but ultimately died from respiratory failure. The case reflects the potentially fatal impact of infections by respiratory viruses in immunocompromised patients and the need for effective approaches to their prevention and treatment.

The German national registry for primary immunodeficiencies (PID).

In 2009, a federally funded clinical and research consortium (PID-NET, http://www.pid-net.org) established the first national registry for primary immunodeficiencies (PID) in Germany. The registry contains clinical and genetic information on PID patients and is set up within the framework of the existing European Database for Primary Immunodeficiencies, run by the European Society for Primary Immunodeficiencies. Following the example of other national registries, a central data entry clerk has been employed to support data entry at the participating centres. Regulations for ethics approvals have presented a major challenge for participation of individual centres and have led to a delay in data entry in some cases. Data on 630 patients, entered into the European registry between 2004 and 2009, were incorporated into the national registry. From April 2009 to March 2012, the number of contributing centres increased from seven to 21 and 738 additional patients were reported, leading to a total number of 1368 patients, of whom 1232 were alive. The age distribution of living patients differs significantly by gender, with twice as many males than females among children, but 15% more women than men in the age group 30 years and older. The diagnostic delay between onset of symptoms and diagnosis has decreased for some PID over the past 20 years, but remains particularly high at a median of 4 years in common variable immunodeficiency (CVID), the most prevalent PID.

Use of linezolid in neonatal and pediatric inpatient facilities--results of a retrospective multicenter survey.

The purpose of this investigation was to describe the use of linezolid in pediatric inpatient facilities. A retrospective multicenter survey including data from nine participating tertiary care pediatric inpatient facilities in Germany and Austria was undertaken. Data on 126 off-label linezolid treatment courses administered to 108 patients were documented. The survey comprises linezolid treatment in a broad spectrum of clinical indications to children of all age groups; the median age was 6.8 years (interquartile range 0.6-15.5 years; range 0.1-21.2 years; ten patients were older than 18 years of age but were treated in pediatric inpatient units). Of the 126 treatment courses, 27 (21%) were administered to preterm infants, 64 (51%) to pediatric oncology patients, and 5% to patients soon after liver transplantation. In 25%, the infection was related to a medical device. Linezolid iv treatment was started after intensive pre-treatment (up to 11 other antibiotics for a median duration of 14 days) and changed to enteral administration in only 4% of all iv courses. In 39 (53%) of 74 courses administered to children older than 1 week and younger than 12 years of age, the dose was not adjusted to age-related pharmacokinetic parameters. In only 17 courses (13%) was a pediatric infectious disease consultant involved in the clinical decision algorithm. Linezolid seemed to have contributed to a favorable outcome in 70% of all treatment courses in this survey. Although retrospective, this survey generates interesting data on the off-label use of linezolid and highlights several important clinical aspects in which the use of this rescue antibiotic in children might be improved.

Delay in B-lymphocyte recovery and function following rituximab for EBV-associated lymphoproliferative disease early post-allogeneic hematopoietic SCT.

Treatment with rituximab is highly effective for EBV-associated post transplant lymphoproliferative disease. However, little is known about its immunological sequelae in pediatric allogeneic hematopoietic SCT (HSCT). Time to normal CD19+ B-lymphocyte values in blood and intravenous immunoglobulin (IVIG) substitution needed to maintain an IgG>400 mg per 100 ml in six consecutive pediatric allogeneic HSCT patients treated with rituximab for symptomatic EBV reactivation were compared with a matched cohort of non-rituximab-treated patients. Follow-up of the six patients ranged from 149 to 1546 days; all but one survived. The mean (+/-s.d.) time to recovery of CD19+ B-lymphocytes was 353+/-142 days as compared with 139+/-42 in the controls (P<0.01). Similarly, substitution of IVIG as a measure of functional B-cell recovery was extended from a mean of 122+/-45 to a mean of 647+/-320 days, and the cumulative dose of IVIG increased from a mean of 1.86+/-0.51 to 4.4+/-0.97 g/kg, respectively (P<0.05). One patient had functional B-lymphocyte deficiency for >3 years and ultimately required two stem cell boosts. Rituximab is a live-saving treatment for pediatric HSCT patients but may lead to prolonged and even persistent B-cell deficiency.