The school shooter had been treated for his illness, and I believe had spent time in a ward. Like any illness, some get too severe to treat effectively.

And the guy with tuberculosis? One flight and he's "flying the oceans"???

From CBC:

"I don't expect those people to ever forgive me. I just hope they understand that I truly never meant them any harm," Andrew Speaker told ABC's Diane Sawyer on Good Morning America, with his voice cracking.

Speaker said he, his doctors and the U.S. Centers for Disease Control and Prevention knew his TB resisted first-line drugs before he left for Europe for his wedding and honeymoon last month.

Speaker said he was in Europe for his wedding and honeymoon when health officials told him had a more dangerous form of TB called extensively drug-resistant tuberculosis.

Isolation order

While in Europe with his new wife and her eight-year-old daughter, Speaker said he felt as if the CDC "abandoned him," that he believed if he did not get to the TB hospital in Denver, he and his wife were scared he might die at a hospital in Italy."

So he flew back to the USA. He is being treated in Georgia and then moved to Denver. Plus, his TB is described as being of "low communicability".