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[Clinical and immunologic findings in BCG osteomyelitis]
Summary
BCG-osteomyelitis, a rare complication of BCG vaccination, can affect children. Surgical removal of affected bone tissue led to recovery in two pediatric cases, with normal immune responses except for reduced spontaneous cell-mediated cytotoxicity.
Area of Science:
- Pediatric Infectious Diseases
- Immunology
- Skeletal Health
Background:
- Bacille Calmette-Guérin (BCG) vaccination is a common preventative measure against tuberculosis.
- BCG-osteomyelitis is a rare but severe late complication following BCG immunization.
- Early diagnosis and intervention are crucial for managing BCG-osteomyelitis.
Observation:
- Two pediatric patients, aged 9 months and 5 years, presented with BCG-osteomyelitis.
- Affected bones included the first metacarpal and the sixth rib.
- Clinical presentation and immunological profiles were evaluated.
Findings:
- Both patients achieved recurrence-free recovery after surgical debridement of granulomatous tissue.
- Humoral immunity and lymphocyte subpopulations were generally normal.
- A diminished proportion of circulating B-cells and reduced spontaneous cell-mediated cytotoxicity (SCMC) were noted.
- Antibody-dependent cytotoxicity (ADCC) remained normal.
Implications:
- Surgical intervention is effective for treating localized BCG-osteomyelitis.
- Immunological investigations reveal specific deficits, such as reduced SCMC, in affected children.
- Understanding these immunological findings may inform future management strategies for BCG-related complications.