What exactly is the giardia vaccine?

For PETs. This vaccine is for the prevention of the intestinal infection giardiasis in dogs and cats or farm animals. There is no current version for humans...
Doesn't yet exist . There is a type of vaccine against Human papillomavirus (HPV) called Gardasil, but to my knowledge there is no licensed or FDA-approved vaccine to giardia, a fresh-water parasite that causes severe diarrhea.