The plague killed so many people for a number of reasons. One of them was because they did not know where it came from so they did not have any way to protect themselves from the rats that carried flees infected with the virus. Also because of the way they deposed of the bodies of the people who died. They just left them in the street and that caused many other people to catch the disease
They also thought it was a punishment from god so they didn't know how to get rid of it. Another reason why is because they didn't know anything about public health so they just dumped the dead bodies into the river and the toilets they had just ran straight into the river which people drank from.
It mainly spread by fleas and rats. Fleas would get the disease and land on people and rats, giving them the disease. Rats would travel everywhere carrying the disease.
the bubonic plague, spread by rats bitten bye infected fleas
about 50 million people died
plague
epidemic
rats
This was a very vague question, but I belive the word you are looking for is "Plague"
it supposedly killed over 33,000 people
It traveled by ship, because they used ships to go many places that we use airplanes for now. It also traveled by human beings going from one place to another on foot or horses. It spread quickly due to the fact that the people did not understand how to prevent it and did not have any effective medicines for it. When a person died of the plague, their corpse often spread the plague, because many times the dead were not buried quickly due to so many people being sick. The priests would visit the sick and they spread the plague themselves that way, unknowingly. The people who were sick were not always quarantined so they had contact with people that they then gave the plague to. There were traveling bands of people who thought the way to stop the plague was to beat themselves with whips, and they spread the plague from place to place, because they went from town to town preaching that the people needed to repent and punish themselves in order for God to deliver them of this plague.
3/4 of Europe died of the plague so every European country had it.
Yes, the mortality rate of plague is not constant depending on what strain and type it is. It can be as high as 90%, so 10% of people who catch it will survive. whatever the disease (like plague), there will normally be some people who are either immune to it and will not get sick or people that get sick but recover from it.
The plague was spread from person to person by fleas who had infected rats that bit humans. Once a person had gotten the plague it was more contagious then the common cold. However doctors thought they could solve this problem when they couldn't with many remedies. Over ten million people died from it.
Black Death or The Black Plague was spread by fleas that were on rats. The Industrial Revolution could be the cause of its rapid spreading, but the cause is actually disputed by many scientists and historians. Many think it spread just because of how contagious it was.