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Infections Identified in Pediatric Sickle Cell Disease

By LabMedica International staff writers
Posted on 21 Mar 2019
Sickle cell anemia is a hereditary disorder of autosomal recessive inheritance that is characterized by sickle-shaped red blood cells. More...
It is the most common type of hemoglobinopathy and is the result of a mutation in the β-globin chain gene that results in creating sickle hemoglobin (HbS) instead of the normal adult hemoglobin (HbA).

Children with sickle cell disease (SCD) are at increased risk for invasive infection with encapsulated bacteria. Antibiotic prophylaxis and immunizations against Streptococcus pneumoniae and Haemophilus influenzae type b (Hib) have decreased the overall incidence of invasive infections and have shifted distribution of serotypes causing disease toward those not covered by immunizations.

Scientists at Emory University (Atlanta, GA, USA) and their colleagues reviewed a large pediatric tertiary care center to identify all isolates of H. influenzae detected in sterile body fluid cultures from January 1, 2010, to December 31, 2017. The results were compared with the center's comprehensive clinical database of all children with SCD to identify all cases of children ages 0 to18 years with SCD with invasive H. influenzae disease for the same time period.

The team found 2,444 patients with SCD, with 14,336 person-years. There were eight episodes of H. influenzae bacteremia in seven children with SCD (five type f, two non-typable, one type a). Most episodes (7/8) were in children younger than five years. The incidence rate of invasive H. influenzae in SCD was 0.58/1,000 person-years for ages 0 to 18 years and 1.60/1,000 person-years for children age less than five years. There were no deaths from H. influenzae infection.

The authors concluded that in the era of universal antibiotic prophylaxis and immunization against Hib, invasive H. influenzae disease due to non-vaccine serotypes remains a risk for children with SCD, particularly those under five years of age. The study was published on February 5, 2019, in the journal Pediatric Blood & Cancer.

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