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Rickettsia prowasekii bacteria

Rickettsia prowasekii bacteria

B220/0521

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Credit

CNRI / SCIENCE PHOTO LIBRARY CNRI / SCIENCE PHOTO LIBRARY

Caption

Scanning electron micrograph (SEM) of a colony of bacteria Rickettsia prowazeki, agent of typhus disease. These bacteria are non-motile, rod-like and Gram-negative. They cause epidemic typhus, a human disease transmitted by the human body louse. R. prowazeki multiply within the louse and exit in louse faeces. Due to louse bites, or scratching by the human victim, these bacteria enter the human bloodstream. Fever, rash and delirium may result, and death may occur if untreated. Treatment is with antibiotic drugs and elimination of the lice. This was a classic European disease. Magnification: x8,000 at 6x7cm size.

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