There was an article in New England Journal of Medicine back in middle 50's about a situation that combined nosocomial and iatrogenic. A search for source of infections with a particular strain of antibiotic resistant staphylococcus in Mass General revealed that an anesthetist was a rectal carrier, and in passing flatus in OR had spread aerosols of the bacteria. I have wondered how his ostracism from OR might have been made unnecessary. Perhaps an astronaut suit.