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Immunological paralysis to pneumococcal polysaccharide in man
Insights
A child experienced immunological paralysis to pneumococcal meningitis for two years. Recovery occurred spontaneously, demonstrating a validated immune response to pneumococcal serotypes in humans.
Area of Science:
- Immunology
- Pediatrics
- Infectious Diseases
Background:
- Pneumococcal meningitis can lead to severe immune responses.
- Understanding immune paralysis is crucial for vaccine development and treatment strategies.
Observation:
- A 9-month-old infant with pneumococcal meningitis developed immunological paralysis to the specific pneumococcal serotype for two years.
- The infant maintained normal immune responses to other antigens, including tetanus toxoid and different pneumococcal/Haemophilus influenzae type b serotypes.
Findings:
- The child spontaneously developed antibodies to the previously paralyzing pneumococcal serotype by age four.
- Re-exposure to the antigen elicited a secondary immune response, indicating restored immunological function.
Implications:
- This case validates the occurrence of pneumococcal immunological paralysis in humans.
- Findings contribute to understanding long-term immune responses following severe infections and inform strategies for managing vaccine-induced or infection-induced immune tolerance.
Abstract:
A 9-month-old infant had severe pneumococcal meningitis and for the next two years showed immunological paralysis to the causal serotype. He remained normally responsive to a protein antigen (tetanus toxoid) and to polysaccharide antigens (Haemophilus influenzae type b capsule and pneumococcal capsule antigens other than the infecting/paralysing serotype). By the fourth year of life the child was spontaneously producing antibody to the infecting/paralysing pneumococcal serotype, at which time rechallenge with the previously tolerising antigen resulted in a secondary response. The occurrence of pneumococcal immunological paralysis in man is therefore validated.