Identification of a BCG Vaccination Scar
Characteristics and Appearance of a BCG Scar
The BCG vaccination scar is a common identifier of tuberculosis immunization. It appears as a small, distinct mark on the upper arm, forming due to localized immune responses.
Identification of a BCG Vaccination Scar
Characteristics and Appearance of a BCG Scar
The Bacillus Calmette–Guérin (BCG) vaccine, primarily used to protect against tuberculosis, often leaves a distinct scar at the site of injection. Recognizing this scar can be important for medical assessments and epidemiological studies.
Appearance of a BCG Scar
- A well-defined circular or oval mark
- Usually 4-10 mm in diameter
- Located on the upper arm, typically the deltoid region
- May have a slightly raised or depressed surface
Why Does the Scar Form?
The BCG vaccine, which contains a live attenuated strain of Mycobacterium bovis, triggers an immune response leading to localized inflammation. This inflammatory process results in tissue necrosis and subsequent scarring.
Clinical Significance
Medical professionals often check for a BCG scar to confirm prior vaccination. The presence of a scar can influence tuberculosis screening protocols and affect diagnostic interpretations.
Scar Variability
Factors affecting scar formation include:
- Age at vaccination
- Technique of administration
- Individual immune response
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