Septicemic plague does not spread from person to person. Patients have fever, chills, prostration, abdominal pain, shock, and bleeding into skin and other organs. When it occurs alone, it is caused in the same ways as bubonic plague however, buboes do not develop. It can be a complication of pneumonic or bubonic plague or it can occur by itself. Septicemic plague occurs when plague bacteria multiply in the blood.Bubonic plague does not spread from person to person. Patients develop swollen, tender lymph glands (called buboes) and fever, headache, chills, and weakness. pestis enter through a break in a person’s skin. This occurs when an infected flea bites a person or when materials contaminated with Y. Bubonic plague is the most common form of plague.Pneumonic plague may also occur if a person with bubonic or septicemic plague is untreated and the bacteria spread to the lungs. Becoming infected in this way usually requires direct and close contact with the ill person or animal. pestis suspended in respiratory droplets from a person (or animal) with pneumonic plague. Pneumonic plague is also spread by breathing in Y. Transmission can take place if someone breathes in aerosolized bacteria, which could happen in a bioterrorist attack. This type of plague can spread from person to person through the air. Depending on circumstances, these forms may occur separately or in combination: Pneumonic plague is one of several forms of plague.

Even so, when released into air, the bacterium will survive for up to one hour, although this could vary depending on conditions. pestis is easily destroyed by sunlight and drying. This bacterium is found in rodents and their fleas and occurs in many areas of the world, including the United States. It is caused by the bacterium Yersinia pestis. Plague is an infectious disease that affects animals and humans.

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