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The plague is a highly infectious and deadly disease caused by the bacterium Yersinia pestis. It is typically spread through the bites of infected fleas, which live on rats and other rodents. There are three main forms of plague that can occur in humans: bubonic plague, septicemic plague, and pneumonic plague.

Bubonic plague is the most common form of the disease and occurs when bacteria are transmitted to a person through the bite of an infected flea. The bacteria multiply in the lymph nodes, causing them to become swollen and painful, known as buboes. This form of the disease can usually be treated successfully with antibiotics.

Septicemic plague is a more serious form of the disease that occurs when the bacteria enter the bloodstream directly from an insect bite or through a wound. In this case, the bacteria multiply rapidly in the blood, leading to septicemia, a life-threatening condition.

Pneumonic plague, also known as pulmonary plague, is a rare but highly infectious and deadly form of the disease. It occurs when the bacteria spread to the lungs, typically through inhalation of respiratory droplets from an infected person or animal. Pneumonic plague can be transmitted directly from person-to-person without the need for a flea vector.

The plague has been responsible for some of the most devastating pandemics in human history. The Black Death, which occurred in Europe during the 14th century, is estimated to have killed between 75 million and 200 million people. More recently, the last plague pandemic began in Asia in the late 19th century and continued into the 20th century, causing tens of millions of deaths.

Yersinia pestis, the bacterium that causes the plague, is a highly virulent and invasive pathogen that primarily infects wild rodents and is transmitted by fleas. It is considered one of the most infectious bacteria in the world, with a mortality rate of up to 90% if left untreated.

Overall, the plague is a serious disease that requires prompt medical attention if symptoms occur. With early treatment, most cases of bubonic plague can be cured successfully, but pneumonic plague and septicemic plague are often fatal without immediate treatment.

Download the new version Disease Infected: Plague