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Possible definitions for rickettsias
rickettsia
Any of the rod-shaped bacteria that make up the family Rickettsiaceae (named for H. Ricketts). They are rod-shaped or variably spherical, and most are gram-negative (see gram stain). Natural parasites of certain arthropods, they can cause serious diseases in humans and other animals, to which they are usually transmitted by a bite from an arthropod carrier. Because certain species can survive considerable drying, rickettsias can also be transmitted when arthropod feces are inhaled or enter the skin through abrasion. Typhus, trench fever, and Rocky Mtn. spotted fever are rickettsial infections. The most effective treatment includes timely and prolonged administration of broad-spectrum antibiotics.
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