Show fleas carry germs fleas carry germs typhoid fever and bubonic plague but these two ills ilia particularly bubonic plague are their most potent threats it was centuries before man discovered the plague was transmitted by fleas however and before the discovery the black death wiped out hall half Eu Ev ropes population In one year in 1807 1907 the indian plague commission finally proved fleas carried the plague the woof proof was simple cages containing rats were hung at different levels above leas fleas the fleas could hop to the lower cages reach the higher ones and all the rats in the lower cages died of 0 the plague |