Since biological warfare in Middle-earth probably involved catapulting corpses into castles, with the desire to spread infection, it wouldn't work on Elves because they aren't vulnerable to infection or disease.
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But Melkor also was there, and he came to the house of Fëanor, and there he slew Finwë King of the Noldor before his doors, and spilled the first blood in the Blessed Realm; for Finwë alone had not fled from the horror of the Dark.
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