[SeeSalt]

The people of US is the most exposed to the TB due to the followings :
1.There is no anti TB vaccination program.
2.Huge traffic of "visitors" form geographical areas where TB is rampant(India, China, Mexico).
3.People with HIV/AIDS _ the most susceptible to acquire TB.

[RedWhitetAndBlue]

"The people of US is the most exposed to the TB due to the followings :
1.There is no anti TB vaccination program."

The reason we don't have a TB vaccination program is because an effective vaccine doesn't exist. BCG, the vaccine for TB, protects to some extent against certain severe types of TB in infants and young children (e.g., TB meningitis) ages 0-5, but it doesn't protect against TB in adults and adolescents. It's only useful for preventing child sickness and death in areas where TB is highly prevalent and the risk of infection is high (and even then it's efficacy is debated).

Since our rates of TB infection are so low relatively, it doesn't make sense to have a vaccination program.