Exactly. Diseases like leprosy, whooping cough, and tuberculosis, which were pretty much eradicated in the U.S. are now cropping up with alarming frequency in areas with large illegal alien population. Yet neither the GOP nor the 'Rats see anything wrong with it.
And some of the strains are immune to our current modes of treatment, like the MDR (multiple drug resistant) type of TB. It costs from tens of thousands up to a million dollars to treat one case of MDR-TB.
At least on Ellis Island in the early 1900's, immigrants were checked for diseases and quarantined and cured before being let out amongst the population. But that was back when the gov. cared about its citizens' health!