THE DISEASE WAS TRANSMITTED THROUGH RATS THEN THE RATS CARRIED IT ONTO THE FLEASE WHICH LED TO HUMANA. THE VIRUS DOES NOT INFECT YOU, IF A FLEA BITES YOU. YOU CAN GET INFECTED IF AN INFECTED HUMAN EITHER COUGHS SNEEZES AND BREATHED ON.
THE PLAGUE FIRST APPEARED IN ASIA BUT NOT ON HUMANS. ONLY RATS AND FLEAS CARRIED THE DISEASE IN ASIA. THE FLEAS THEN BROUGHT IT INTO EUROPE AND INFECTED SHIP IN 1347 AND RAPIDLY SPREAD AROUND KAFF ISLAND.