The concept and rumination over delivering bio-weapons in similar fashion is not unheard of.
Just the top of my head - Unit 731 plague-infested fleas and "Operation Cherry Blossoms" in Japan, Operation Big Buzz" (1955) and "Operation Drop Kick" (1956), "Биопрепарат" (1974) in the USSR, and history of chucking plague-infected corpses (flying dead cows anyone?) in siege warfare.
Just the top of my head - Unit 731 plague-infested fleas and "Operation Cherry Blossoms" in Japan, Operation Big Buzz" (1955) and "Operation Drop Kick" (1956), "Биопрепарат" (1974) in the USSR, and history of chucking plague-infected corpses (flying dead cows anyone?) in siege warfare.