- Note: Webster 1913 prefers the spellng "cystitis" - I'm not sure if this is a case of Webster being outdated (what are the odds on THAT, ha) or both spellings being acceptable - regardless, I checked several medical databases, and the S spelling is legit.
thanks to:
http://www.erowid.org/herbs/yarrow/yarrow.shtml
http://www-msu.mcmaster.ca/services/shec/UTI.htm