Feverish state

Most immortal people do not have to suffer through common human things like getting the flu, most immortal people. But when you were born a human who altered there being to become immortal, it's just different.

Il Dottore catches a Heavy flu and he swears "Pantalone, I think I'm dying" but pantalone scoffs and says "Calm down. It's just a fever."

Will Dottore realize that he has in fact not been poisoned?