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[BCGitis/BCGosis in children: Diagnosis, classification and exploration]
M Kourime1, E N K Akpalu2, H Ouair3
1Unité d'immunologie clinique, service des maladies infectieuses, hôpital d'enfants Abderrahim Harouchi, CHU Ibn Rochd, Casablanca, Maroc.
Insights
The Bacille Calmette-Guérin (BCG) vaccine prevents severe childhood tuberculosis but can cause rare complications like BCGitis or BCGosis. Early diagnosis and management are crucial, especially in immunocompromised individuals.
Area of Science:
- Immunology
- Vaccinology
- Infectious Diseases
Background:
- The Bacille Calmette-Guérin (BCG) vaccine is a widely used live vaccine protecting children against severe tuberculosis.
- While generally safe, BCG vaccination can lead to rare complications, including local BCGitis and disseminated BCGosis.
- The incidence and presentation of BCG complications vary geographically.
Purpose of the Study:
- To review the epidemiology, etiology, diagnosis, and management of BCG vaccine complications.
- To highlight the importance of identifying underlying immunodeficiencies in patients with BCG disease.
- To discuss recent advances in molecular diagnostics for differentiating BCG infections.
Main Methods:
- Review of existing literature on BCG complications.
- Analysis of diagnostic approaches including clinical examination and laboratory findings.
- Discussion of therapeutic strategies and management guidelines.
Main Results:
- BCG complications range from localized inflammation to life-threatening disseminated disease.
- Etiologies include vaccine-related factors (technical errors, strain) and patient-related factors (primary or acquired immunodeficiencies).
- Molecular biology aids in distinguishing BCG disease from other mycobacterial infections.
Conclusions:
- Prompt diagnosis and investigation of underlying immune defects are essential for managing BCG complications.
- Prognosis is influenced by immune status and the timeliness of appropriate management.
- Standardized diagnostic and therapeutic protocols for BCG disease are evolving.
Abstract:
The Bacille Calmette-Guérin (BCG) vaccine is used extensively worldwide, and more than 100 million children are vaccinated each year. This is a live vaccine that protects against severe tuberculosis in children. However, BCG complications, specific to the BCG vaccine, do occur, although the epidemiology differs from one country to another. Nevertheless, these complications are considered to be rare and range from benign local BCGitis to BCGosis, a potentially lethal disseminated disease. Etiologies of BCGitis/BCGosis can be related to the vaccine itself (technical errors, vaccinal strain) or to the patient. Indeed, it is well established that some immunodeficiencies, primary or acquired, can expose the patient to BCG disease. The diagnosis of a BCG disease lies on clinical examination and laboratory results. Recent advances in molecular biology help to distinguish BCG disease from other mycobacterial infections, especially from tuberculosis. When BCG complications have been confirmed, the underlying defect should be investigated, particularly if other features of immunodeficiency are reported, such as recurrent infection, failure to thrive, etc. Prognosis largely depends on the immune status, but also on the management of the BCG disease. Although the therapeutic protocols are still controversial, there are more and more publications on the diagnosis and management guidelines of the disease.
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