For me, it was the FLU.
Breaking Bad Season 2, Episode 10
...two or three days later he gets the FLU
or a heart attack and he keels over.
Breaking Bad Season 3, Episode 12
C: Moral support
during FLU shots""
The Big Bang Theory Season 5, Episode 10
I think I might have the FLU.
The Big Bang Theory Season 3, Episode 15
Like you've got the FLU?
Breaking Bad Season 5, Episode 16