Which organism causes bubonic plague?

Which organism causes bubonic plague?

• A. Yersinia pestis
• B. Bacillus anthracis
• C. Borrelia burgdorferi
• D. Rickettsia prowazekii

Answer: (A)

Bubonic plague is caused by Yersinia pestis, a gram-negative bacterium transmitted to humans by fleas that feed on infected rodents. In the bubonic form, the bacteria seed regional lymph nodes, leading to painful swollen nodes called buboes; without treatment, the infection can spread and become septicemic or pneumonic. The other organisms represent different diseases: Bacillus anthracis causes anthrax, Borrelia burgdorferi causes Lyme disease, and Rickettsia prowazekii causes epidemic typhus. So the agent responsible for bubonic plague is Yersinia pestis.

Bubonic plague is caused by Yersinia pestis, a gram-negative bacterium transmitted to humans by fleas that feed on infected rodents. In the bubonic form, the bacteria seed regional lymph nodes, leading to painful swollen nodes called buboes; without treatment, the infection can spread and become septicemic or pneumonic. The other organisms represent different diseases: Bacillus anthracis causes anthrax, Borrelia burgdorferi causes Lyme disease, and Rickettsia prowazekii causes epidemic typhus. So the agent responsible for bubonic plague is Yersinia pestis.