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Rickettsioses

Rickettsial infections are caused by multiple bacteria from the order Rickettsiales and genera Rickettsia, Anaplasma, Ehrlichia, Neorickettsia, Neoehrlichia, and Orientia (Table 4-19). Rickettsia spp. are classically divided into the spotted fever group (SFG) and the typhus group, although more recently these have been classified into as many as 4 groups. Orientia spp. make up the scrub typhus group. The rickettsial pathogens most likely to be encountered during travel outside the United States include Rickettsia africae (African tick-bite fever), R. conorii (Mediterranean spotted fever), Anaplasma phagocytophilum (anaplasmosis), R. rickettsii (known as both Rocky Mountain spotted fever and Brazilian spotted fever), Orientia tsutsugamushi (scrub typhus), and R. typhi (murine typhus).Most rickettsial organisms are transmitted by the bites or infectious fluids (such as feces) inoculated into the skins from ectoparasites such as fleas, lice, mites, and ticks. Inhaling bacteria or inoculating conjunctiva with infectious material may also result in infection. The specific vectors that transmit each form of rickettsiae are listed in Table 4-19. Transmission of a few rickettsial diseases from transfusion of infected blood products or by organ transplantation is rare but has been reported. 

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