| Emerging and re-emerging rickettsioses: endothelial cell infection and early disease events. 2008     Rickettsiae   cause some of the most severe human infections, including epidemic typhus and   Rocky Mountain spotted fever. Substantial progress has been made in research   into the genomics, vector relationships, pathogenesis and immunity of these   obligate, intracellular, arthropod-transmitted bacteria.  Nat Rev   Microbiol 2008, 6:375-386. PubMed Abstract | Publisher Full Text  Walker DH, Ismail N.   
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