[schmelvin]

If these diseases are so widespread as to constitute a real danger to our society from immigration, why do we allow Americans to travel to Mexico? Tourists might actually be exposed to these "poor" people working as bus-boys and hotel maids, yeeks!

Because, prior to leaving America for a third world destination, you're supposed to go to a travel clinic and receive a series of vaccinations.

[endthematrix]

Also, because we (USA) travel at our own risk and take precaution. The unhealthy that migrate to the US don't care of your health. They just assume to spit, cough and bleed. Mostly when handling you food.