It's not "people traveling" as this phrase is commonly understood, that is the issue; it's "relocation of 5% of a small country's population (Nicaragua for example) into the USA".
>Most tuberculosis (TB) cases in the US are diagnosed in foreign-born persons, and undocumented foreign-born may face particular barriers to timely access to health services.
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.
TB is a disease of poverty, it doesn't spread that easily, but the risk goes up for people in overcrowded living situations and for those who are chronically malnourished.
It's not a great surprise that one would find TB in cross-border migrants, but it's an indictment of the system that the disease continues to spread over here.
oh, but wait! it is actually endemic among native armadillos (USA) and native red squirrels (UK) - you almost never see a red squirrel in the UK, so don't worry.
We have ~20% immigrant population, yet TB cases have been decreasing since at least 2016. (rates since at least 2009?)
Why do you think your hypothesis would be stronger than TFA's?