Identification of BCG Scar
Clinical Importance of BCG Scar
The BCG scar is a small, round, raised mark resulting from Bacillus Calmette-Guérin vaccination against tuberculosis. Its presence is clinically significant for evaluating prior immunization and understanding TB exposure risks.
Identification of BCG Scar
Clinical Importance of BCG Scar
BCG (Bacillus Calmette-Guérin) vaccination is a widely used immunization against tuberculosis (TB). It often leaves a distinct scar at the site of injection, which serves as an indicator of prior vaccination.
Characteristics of BCG Scar
- Generally appears on the upper arm
- Small, round, and slightly raised
- Diameter varies from 2 to 10 mm
- Typically forms within 2–6 months post-vaccination
Clinical Relevance
Identifying a BCG scar is crucial in clinical settings, particularly for:
- Assessing prior tuberculosis immunization
- Evaluating the necessity for re-vaccination
- Understanding TB exposure risks in different populations
BCG Scar and Tuberculin Skin Test (TST)
BCG vaccination can influence the tuberculin skin test (TST) results. The presence of a BCG scar may lead to a false-positive reaction in TST, making it important to consider alternative diagnostic methods such as interferon-gamma release assays (IGRAs).
Global Variations
BCG vaccination policies differ across countries. Some nations administer multiple doses, while others provide it only at birth. These differences impact the presence and significance of BCG scars in various populations.
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