You've hit the nail on the head with the problem with bio-weapons. 'The anthrax wasn't in the air';
Deliver the biological weapon is the problem? The first world isn't the native indian tribes. We'd isolate infection.
The vector is the problem.

AIDS isn't a bio-weapon and zombies don't exist.
The Sock
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The world is in haste and nears its end – Wulfstan II Archbishop of York 1014.