body’s natural defense mechanism, representing a successful encounter between the immune system and the vaccine rather than a medical failure or an untreated wound.
A persistent misconception suggests that the presence of this scar is a sign of poverty or a lack of modern healthcare, but the reality is rooted in global public health policy. In the 20th and 21st centuries, many countries with high tuberculosis burdens—regardless of their wealth or industrial status—implemented universal BCG immunization programs to protect infants. Because TB was once a global threat, millions of people
