This makes me so angry I just want to scream. A 31-year-old man who knew he had tuberculosis flew from Atlanta to Paris and then - after learning in Paris that he had extensively drug-resistant tuberculosis - flew from Prague to Montreal. Extensively drug-resistant tuberculosis (XDR TB) occurs when two classes of anti-tubercular drugs have become ineffective in treating the person's disease. It's so rare that only 49 people in the US have been diagnosed with it since 1993. He chose to travel by commercial air, placing other passengers at risk. He had been advised not to travel. But, of course, he had to make the trip - it was his honeymoon. They don't know exactly when or where he caught it. What is most ironic is that his wife's father is a CDC microbiologist studying ... you got it ... tuberculosis.