Hugh contracted diarrhea from a mush bar. I checked his status 0.3 cycles before he was scheduled to cure naturally. After he cured, he appeared not to be suffering diarrhea symptoms, but the green bubble animation was still there.
Getting the mush runs seems like a pretty rare occurrence (which, honestly, makes the cooking station seem pretty frivolous). No one else in my games has caught it. Haven't been able to reproduce thus far.