So (assuming inhalation infection) they're coughing up blood, have meningitis, cardiovascular collapse? 50%+ chance of death even with treatment? Okay then!
I mean, you don't tend to get mild inhalation anthrax: "Oh, sorry I had to cancel the meeting last week, I came down with a bit anthrax but I'm okay now" isn't really a thing. You either don't have inhalation anthrax, or you're in very deep shit. And even if you have the safest form (cutaneous) where you have a very good chance of survival with treatment, you'll have one hell of a skin lesion to show off.