[jvanderbot]

When leaving the USA, getting TB vaccine is highly recommended and (at least in my experience) free and easy. I think it's fairly clear GP meant folks coming into the USA, and not for short periods, from areas that are not able to supply vaccines regularly.

This very well might be an issue. UNICEF and other aid organizations work dilligently to eradicate TB and other poverty-adjacent diseases, so perhaps individuals and the US Gov should increase their aid to other nations.