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Pneumonic plague, a severe type of lung infection, is one of three main forms of plague, all of which are caused by the bacterium ''Yersinia pestis''. It is more virulent and rarer than bubonic plague. The difference between the versions of plague is simply the location of the infection in the body; the bubonic plague is an infection of the lymphatic system, the pneumonic plague is an infection of the respiratory system, and the septicemic plague is an infection in the blood stream. Typically, the pneumonic form is due to a spread from infection of an initial bubonic form. Primary pneumonic plague results from inhalation of fine infective droplets and can be transmitted from human to human without involvement of fleas or animals. Untreated pneumonic plague has a mortality rate from 90-100%. ==Signs and symptoms== The most apparent symptom of pneumonic plague is coughing, often with hemoptysis (coughing up blood). With pneumonic plague, the first signs of illness are fever, headache, weakness and rapidly developing pneumonia with shortness of breath, chest pain, cough and sometimes bloody or watery sputum.〔 The pneumonia progresses for two to four days and may cause respiratory failure and shock. Patients will die without early treatment, some within 36 hours. Initial pneumonic plague symptoms can often include the following: * Fever * Weakness * Headaches * Nausea Rapidly developing pneumonia with: * Shortness of breath * Chest pain * Cough * Bloody or watery sputum (saliva and discharge from respiratory passages). 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「pneumonic plague」の詳細全文を読む スポンサード リンク
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