answersLogoWhite

0

The black death began to spread in about 1437 during the Middle Ages from fleas that bit mice and rats that were infected with a the black death. The fleas would swell from the infected blood they took in and vomit it out. Fleas love to bite humans and infected fleas bit any human they could find spreading the black death.

User Avatar

Wiki User

16y ago

What else can I help you with?