Wait until Bydum’s Illegal’s hit the US, TB, Ebola, Dengue Fever, Black Plague, NO Vaccines.
TB and Ebola both have vaccines, though the latter isn’t the most effective thing ever. Ebola also doesn’t spread particularly well. Bubonic plague is fixed with antibiotics. I’d be much more concerned with them flooding in with measles, weird flu strains, and other things that are highly contagious and where we have gaps in coverage.
Some people can’t get vaccines because of medical conditions. A small number choose not to (and then get more vocal about that choice than vegans or people who do CrossFit). Some have been vaccinated, but have virtually no immune system due to HIV/AIDS, automimmune disorder treatments, or cancer treatments. The last thing any of those people need are some infected persons sneaking into the country spreading stuff around.