Well, if it's not CHOLERA,
then based on a quick Internet search...
The Big Bang Theory Season 4, Episode 2
There's no CHOLERA in Pasadena.
The Big Bang Theory Season 4, Episode 2
a bar stool dipped in CHOLERA?
The Big Bang Theory Season 5, Episode 2
I believe I may have CHOLERA.
The Big Bang Theory Season 4, Episode 2
Cholera is water-borne.
You're mocking me.
The Big Bang Theory Season 5, Episode 2