Right so why don't we give people in the US a TB vaccine?
A really effective one isn't currently available, but they're working on an improved vaccine. Vaccinating with the current one makes the tuberculin skin test not reliable, so in less high-risk areas (like the US)
it's not worth the trade-off until they develop a 99+% (or whatever%) effective vaccine.
EDIT: from Wikipedia
Vaccines
The only currently available vaccine as of 2011 is bacillus Calmette–Guérin (BCG) which, while it is effective against disseminated disease in childhood, confers inconsistent protection against contracting pulmonary TB.[67] Nevertheless, it is the most widely used vaccine worldwide, with more than 90% of all children being vaccinated.[7] However, the immunity it induces decreases after about ten years.[7] As tuberculosis is uncommon in most of Canada, the United Kingdom, and the United States, BCG is only administered to people at high risk.[68][69][70] Part of the reasoning arguing against the use of the vaccine is that it makes the tuberculin skin test falsely positive, and therefore, of no use in screening.[70] A number of new vaccines are currently in development.[7]
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