A vomit FB... no big deal at all. I open my trap-airlock - a room open to the caverns at one end with 4 bridges for an airlock system, and fortifications all along the sides. I use a wood door as bait and end up trapping the FB in my airlock.
My airlock has a retractable roof, which I can open and then send a random peasant wrestler on the top wall of the fortifications, which gets him coated in FB dust, at which point I send him into the secondary cavern airlock.
I wait for him to show any signs of the FB - he gets minor dizziness, that's all. I then proceed to open the airlock that the FB is in to the inside of my fort... with my best squad stationed on the other side (legendary in all combat skills, all very strong, agile, good spatial and kinesthetic sense - masterwork steel weapons & armor w. candy mail shirt). I then zoom to watch the slaughter, and the FB goes down through the access tunnel, but doesn't come up!. I zoom down a z-level and the FB is going through a secondary access tunnel which I forgot I had - so the FB is now taking a direct route to the inside of my fort - and there's nothing I can do about it, military is chasing but won't get there in time for the FB to land in my main thoroughfare.
"Ahh, no big deal. It's made of vomit so it won't make too much of a mess - and light dizziness is not a bad syndrome".
I go to check on my wrestler, who's still in the holding cell.
He's dead.
HE'S DEAD.
suffocated to systemic paralysis - which was the second stage of the FB syndrome. And the beast was loose, heading to dining hall.
After spending a few minutes on pause, I remember that my second and third squads were idling in my meeting hall. WOOT. I would be able to intercept my FB in the access tunnels, away from the general public. And that's what I did.
Sure as hell killed 9 of the soldiers after the battle, but thank Armok that dust wasn't contagious.