There was the spread of a plague but the exact nature of the plague is unknown. It is widely believed to be a strain of Bubonic Plague.
The bubonic plague started in Asia and spread to Europe.
In a nutshell, bubonic plague is an infection of the lymph nodes resulting from the bite of an infected flea. The flea gets infected by biting an infected rodent, usually a rat or mouse. When the rodent dies, the flea seeks another host--another rodent or a human.
Plague is a serious, potentially life-threatening infectious disease that is usually transmitted to humans by the bites of rodent fleas.
Rats, fleas, and mice where mainly the first to get the plague and spread it around.
black death Plague was spread via silk road. Mongol armies also spread it.
Flu is spread through contact of an infected. While Plague and malaria is spread via fleas and mosquito.
the bubonic plague, spread by rats bitten bye infected fleas
Black Death Plague spread from country to country. It spread across whole Europe.
The animal that started the plague first was the rat. They had parasites in their skin and spread it to humans
Black Death Plague had spread across Europe. It also spread in Russia and other northern empires as well.
fleas on rats