is the bacterium
that causes cholera
. It belongs among the gamma subdivision of proteobacteria
. There are two dominant strains, classic and El Tor
. are in the O1 serogroup and both contain Inaba, Ogawa and Hikojima serotypes
It colonizes the gut, where it adheres to villous absorptive cells via filaments, and secretes a toxin, causing massive fluid and electrolyte loss by diarrhea.