
...will be scanning his face
for signs of CONTAGIOUS skin disease?
The Big Bang Theory Season 3, Episode 16

Her spontaneity
is CONTAGIOUS.
The Big Bang Theory Season 5, Episode 14

She might be CONTAGIOUS.
The Big Bang Theory Season 7, Episode 6

I'm sure she's not CONTAGIOUS.
The Big Bang Theory Season 1, Episode 11

If influenza was only CONTAGIOUS
after symptoms appear...
The Big Bang Theory Season 1, Episode 11