[Answer] What is unique about Rickettsia?

Answer: although classified as bacteria, they behave like viruses
What is unique about Rickettsia?
The generalized enlargement of lymph nodes is unique among rickettsial diseases. Orientia (Rickettsia) tsutsugamushi is phagocytosed by the host cell escapes from the phagosome into the cytosol divides by binary fission and is released from projections of the cell membrane . The pathogenic mechanism of O tsutsugamushi is not known.
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As obligate intracellular pathogens Rickettsia bacteria cannot survive outside the body of a host. For this reason they cannot be found living freely in terrestrial or aquatic environments. However they can be found in different types of vectors ( arthropods) including mites lice fleas and ticks.
The rickettsiae are a heterogeneous group of small obligately intracellular gram-negative coccobacilli and short bacilli most of which are transmitted by a tick mite flea or louse vector. Except in the case of louse-borne typhus humans are incidental hosts.
Rickettsial infections are caused by multiple bacteria from the order Rickettsiales and genera Rickettsia Anaplasma Ehrlichia Neorickettsia Neoehrlichia and Orientia . Rickettsia spp. are classically divided into the spotted fever group (SFG) and the typhus group although more recentl…

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