Phoenix flight passengers told to get precautionary tuberculosis test - latimes.com Mixed feelings about this. People undergoing chemotherapy or anyone with compromised immune systems are especially vulnerable to infectious diseases. TB is one of those that can be deadly, so glad there was a warning system in place. Although a little late, the system did kick in. Just wondering if there are other reasons for being placed on the no-fly list that we're not being told about. Are there other conditions under which personal medical information is shared across government agencies?