CNRI / SCIENCE PHOTO LIBRARY CNRI / SCIENCE PHOTO LIBRARY
False-colour shadow transmission electron micrograph (TEM) of an individual bacterium of genus Rickettsiae, a group of very small, non motile, rod like, Gram-negative bacteria. Like viruses, Rickettsiae are obligate intracellular parasites, ie they cannot live outside of the host's cells. Rickettsiae infect ticks and mites, through whom they may infect mammals (including man), causing serious diseases. Rickettsia akari causes rickettsial pox, several rickettsial species cause different forms of typhus, and R. rickettsii is responsible for Rocky Mountain spotted fever. Magnification: X 38,000 at 35mm size.
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