Infections of the Central Nervous System by W. Michael Scheld & Richard J. Whitley & Christina M. Marra

Author:W. Michael Scheld & Richard J. Whitley & Christina M. Marra [Scheld, W. Michael]
Language: eng
Format: epub
ISBN: 9781451173727
Publisher: Lippincott Williams & Wilkins
Published: 2014-04-21T00:00:00+00:00

CHAPTER 27 RICKETTSIOSES, ANAPLASMOSES, AND Q FEVER

DIDIER RAOULT

Bacteria in the order Rickettsiales are gram-negative microorganisms that grow in association with eukaryotic cells. They do not grow in axenic media but require living hosts such as cell cultures, embryonated eggs, or susceptible animals. With the exception of Rickettsia prowazekii, the agent of epidemic typhus, and possibly Rickettsia felis in sub-Saharan Africa, these bacteria infect humans incidentally as zoonoses. On the basis of molecular phylogeny, the bacteria causing rickettsial diseases have been reclassified (Table 27.1). Rickettsioses are emerging infectious diseases, with many new rickettsial diseases having been described in the past 15 years. Rickettsioses can be grouped as follows: Q fever, ehrlichioses, and diseases caused by Rickettsia and Orientia species.

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