mdsslave 2 Posts Has 22 years experience. Jan 10, 2007 If you can smell the C-diff, pseudomonis, etc., you have sucked particles of the organism into your nasal passages, which is why you continue to smell it for so long. Your own system has to overcome the "sample". I carry a saline/TeaTree nasal spray in my bag to help overcome such occurances (as well as to proactively circumvent any stray flu/cold bugs that think I'm an inviting host!).