Say I had pneumonia, and did not go to the hospital.

Say further that I had my RX for antibiotics called in.

I could develop C. diff. just here at home. C. diff is one of those
organisms that is "around"...just not present in enough quantity to cause illness.

In fact if you took a swab of your throat, you'd be amazed what is in that! We did this in microbiology..cultured our own, and identified all the nasty pathogens! Only they were there in very low amounts and not causing illness, because our immune systems were active. Change of immune status may let those nasty bugs, then take hold. Icky isn't it!

C.diff is classed as a noscomial infection. That is only appears when someone is treated for something ELSE. In fact antibiotic treatment does not totally irradicate a germ. It reduces it to very minute levels to where the body should take care of the rest. This is the way that drug resistance occurs.