Bubonic plague, the most common form, is characterized by very high fever, chills, prostration, delirium, hemorrhaging of the small capillaries under the skin, and enlarged, painful lymph nodes (buboes), which suppurate and may discharge. Invasion of the lungs by the organism (pneumonic plague) may occur as a complication of the bubonic form or as a primary infection. Pneumonic plague is rapidly fatal and is spread from person to person (by droplet spray) without intermediary transmission by fleas. In the black form of plague, hemorrhages turn black, giving the term
Black Death to the disease. An overwhelming infection of the blood may cause death in three or four days, even before other symptoms appear.
In untreated cases of bubonic plague the mortality rate is approximately 50%–60%; pneumonic plague is usually fatal if not treated within 24 hours. Such antibiotics as streptomycin and tetracycline greatly reduce the mortality rate, especially of bubonic plague. Vaccine is available for preventive purposes. Rodent control is important in areas of known infection.
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