How the black death transfered?

The Black Death, caused by the Yersinia pestis bacterium, was primarily transmitted through the bites of infected fleas that lived on black rats. These fleas would feed on an infected rat, ingest the bacteria, and then transmit it to humans when they fed on them. This method of transmission is known as vector-borne transmission.

When an infected flea bit a human, the bacteria would enter the person's body and cause infection. The symptoms of the Black Death could appear within a few days to a few weeks after the bite and included fever, chills, swollen lymph nodes (known as buboes), vomiting, diarrhea, and skin discoloration. Without proper treatment, the infection could quickly become fatal.

While flea bites were the primary means of transmission, the Black Death could also be spread through direct contact with an infected person's bodily fluids, such as blood, pus, or saliva. This type of transmission occurred less commonly but still contributed to the spread of the disease.

Additionally, contaminated objects or surfaces could also transmit the bacteria. For example, if an infected person touched an object and someone else later touched that same object, they could potentially become infected if the bacteria were transferred to their skin.

Overall, the combination of flea bites, direct contact with infected individuals, and contact with contaminated objects facilitated the rapid and widespread transmission of the Black Death during the pandemic.