Pneumonic plague is the most serious form of the disease and is the only form of plague that can be spread from person to person (by infectious droplets). The pneumonia may cause respiratory failure and shock. Pneumonic plague may develop from inhaling infectious droplets or from untreated bubonic or septicemic plague that spreads to the lungs. Pneumonic plague: Patients develop fever, headache, weakness, and a rapidly developing pneumonia with shortness of breath, chest pain, cough, and sometimes bloody or watery mucous.This form results from bites of infected fleas or from handling an infected animal. Septicemic plague can occur as the first symptoms of plague or may develop from untreated bubonic plague. Skin and other tissues may turn black and die, especially on fingers, toes, and the nose. Septicemic plague: Patients develop fever, chills, extreme weakness, abdominal pain, shock, and possibly bleeding into the skin and other organs.If the patient is not treated with appropriate antibiotics, the bacteria can spread to other parts of the body. The bacteria multiply in a lymph node near where the bacteria entered the human body. This form is usually the result of an infected flea bite. Bubonic plague: Patients develop fever, headache, chills, and weakness and one or more swollen, painful lymph nodes (called buboes).Top of Page What are the different forms of plague? Finally, people can become infected from inhaling respiratory droplets after close contact with cats and humans with pneumonic plague. People can also become infected from direct contact with infected tissues or fluids while handling an animal that is sick with or that has died from plague. People most commonly acquire plague when they are bitten by a flea that is infected with the plague bacteria. How do people become infected with plague? These bacteria are found in many areas of the world, including the United States. It is caused by the Yersinia pestis bacteria. Plague is an infectious disease that affects rodents, certain other animals, and humans. Is a vaccine available to prevent plague?.Who is at risk for getting plague in the United States?.Where is plague most common in the United States?.Is the disease seasonal in its occurrence?.How many cases of plague occur in the United States? Globally?.What is the incubation period for plague?.Could one person get plague from another person?.What is the basic transmission cycle of plague?. What are the different forms of plague?.How do people become infected with plague?.
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