This episode of This Podcast Will Kill You actually goes into that: player.fm/series/…/ep-31-giardia-gerardia

There is also a transcript if you just want to read about it: thispodcastwillkillyou.com/…/TPWKY-Episode-31-Gia…

(Warning: they make an alcoholic beverage towards the beginning of each episode in case anyone is in recovery)