[Infections and antibiotic prophylaxis in sickle cell disease]

Area of Science:

• Pediatric Infectious Diseases
• Hematology
• Immunology

Context:

• Bacterial infections are a leading cause of illness and death in young children with sickle cell disease (SCD).
• Homozygous SCD (HbSS) and SC hemoglobinopathy present increased susceptibility to bacteremia, with higher incidence rates in children under three years old.
• Common pathogens include Streptococcus pneumoniae and Salmonella species, leading to severe conditions like septicemia, meningitis, osteomyelitis, and pneumonia.

Purpose:

• To highlight the significant risk of bacterial infections in children with sickle cell disease.
• To emphasize the severity of these infections and their impact on morbidity and mortality.
• To underscore the importance of preventive strategies such as antibiotic prophylaxis and vaccination.

Summary:

• Children with sickle cell disease experience a high incidence of bacteremia, with rates of approximately 8 and S events/100 patient-years in homozygous SCD and SC hemoglobinopathy, respectively, under age three.
• Key bacterial culprits are Pneumococci and Salmonellae, often causing severe manifestations including septicemia, meningitis, osteomyelitis, and pneumonia.
• Infections with Mycoplasma pneumoniae and Chlamydia pneumoniae can also be severe, potentially leading to acute chest syndrome.

Impact:

• The high burden of bacterial infections in pediatric SCD necessitates proactive prevention measures.
• Oral penicillin prophylaxis, recommended from three months of age, is effective against pneumococcal infections.
• Antipneumococcal conjugate vaccines are safe and immunogenic in infants, offering crucial protection.