BCG vaccination is not recommended in the United States primarily because of the low prevalence of Mtb. Additionally, it does not provide sufficient protection against adult pulmonary TB and the vaccine can produce false positive tuberculin skin test (TST) results. 

Tulane University

The most frequently used live-attenuated bacterial vaccine is the BCG vaccine. Derived from the bovine strain of Mycobacterium tuberculosis, this vaccine prevents childhood tuberculosis meningitis. Although BCG is a routine vaccination for children in European countries, it is not used in the United States. 

BCG Vaccine

Parham, P. (2009). Vaccination to Prevent Infectious Disease. In 1145902806 862124677 J. Foltin (Ed.), The Immune System (3rd ed., pp. 439-440). New York, New York: Garland Science, Taylor &amp; Francis Group.

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