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Clinical features of mild systemic meningococcal disease with characterization of bacterial isolates
Abstract:
Neisseria meningitidis is an important cause of fulminant septicemia and meningitis in children. Only limited reports of mild disease associated with this organism exist. In this study, we describe eight children, ages 2.5-19 months, with mild meningococcal disease and characterize the meningococcal isolates from some of these patients. Children with mild meningococcal disease presented with a mean fever of 40.1 degrees C, but without purpura or petechiae. Five were diagnosed as having otitis media and were not thought to be seriously ill when initially observed. Six of the eight children had complete resolution of their clinical symptoms as outpatients. One had apparent meningococcal meningitis that sterilized without antibiotic therapy, and one had persistent low grade bacteremia that cleared within 48 hours after institution of parenteral antibiotics. Characterization of the meningococcal isolates from three of the patients revealed that the organisms were encapsulated, piliated, and contained similar outer membrane proteins. This report confirms that blood stream invasion by N. meningitidis organisms may result in clinically mild disease.
Insights
Neisseria meningitidis can cause mild illness in children, not just severe meningitis or septicemia. This study details eight cases of mild meningococcal disease, highlighting varied presentations and outcomes.
Area of Science:
- Pediatrics
- Infectious Diseases
- Microbiology
Background:
- Neisseria meningitidis is a significant pathogen, typically causing severe invasive diseases like meningitis and septicemia in children.
- Mild presentations of meningococcal disease are infrequently reported, leading to underestimation of the organism's clinical spectrum.
Purpose of the Study:
- To describe clinical features and outcomes of mild meningococcal disease in infants and young children.
- To characterize the microbiological properties of Neisseria meningitidis isolates from these mild cases.
Main Methods:
- Retrospective case series of eight children (2.5-19 months) diagnosed with mild meningococcal disease.
- Clinical data collection including symptoms, fever, and treatment response.
- Microbiological characterization of Neisseria meningitidis isolates (encapsulation, pili, outer membrane proteins).
Main Results:
- Children presented with high fever (mean 40.1°C) but lacked purpura or petechiae.
- Five cases were initially diagnosed with otitis media, indicating a potential for misdiagnosis of mild illness.
- Six children resolved symptoms as outpatients; one had self-resolving meningitis, and another had transient bacteremia.
Conclusions:
- Neisseria meningitidis can cause clinically mild infections in children, challenging the perception of it solely as a cause of severe disease.
- Recognition of mild meningococcal disease is important for accurate diagnosis and management, preventing unnecessary alarm or delayed care.