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[Howard T. Ricketts, U.S. pathologist, 1871-1910]
A genus of bacteria of the family Rickettsiaceae, order Rickettsiales. They are obligate intracellular parasites and are the causative agents of many diseases. Their vectors are arthropods.
SEE: rickettsial disease; SEE: rickettsialpox; SEE: rickettsiosis; SEE: tick-borne rickettsiosis