Infections
an infectious, plaguelike, zoonotic disease caused by infection with the bacillus Francisella tularensis. It is found primarily in rodents but also affects humans and many other animals; rabbits, squirrels, and muskrats are the primary source of infection. It is transmitted by the bites of deer flies, fleas, and ticks; by contact with contaminated animals or […]
Read more →an acute infectious, systemic, usually self-limited disease of worldwide distribution, caused by various species of the genus Borrelia; it may be either endemic or epidemic and is transmitted by the bites of either the body louse (Pediculus humanus corporis), for which humans are the reservoir, or Ornithodoros ticks, for which rodents and other animals are […]
Read more →the etiologic agent of Rocky Mountain spotted fever, transmitted by Dermacentor, Rhipicephalus, Haemaphysalis, Amblyomma and Ixodes ticks from a natural reservoir in rodents, dogs, and foxes. Called also Dermacentroxenus rickettsii.
Read more →an acute, infectious, sometimes fatal disease caused by Rickettsia rickettsii, usually transmitted by the bite of an infected ixodid tick, usually Dermacentor andersoni (wood tick) or D. variabilis (dog tick); it occurs only in North and South America. It is characterized by sudden onset; chills; fever lasting 2 to 3 weeks; a cutaneous rash that […]
Read more →an acute, benign febrile infection caused by an arenavirus, transmitted by the bite of the wood tick, Dermacentor andersoni, occurring in areas in which the tick is distributed, i.e., the Rocky Mountain area and Pacific slope of the United States and Canada, and characterized chiefly by a biphasic course and leukopenia. Called also mountain tick […]
Read more →an acute, generally self-limited rickettsial infection caused by Coxiella burnetii, characterized by fever, chills, headache, myalgia, malaise, and very rarely rash, and sometimes complicated by mild pneumonia (Q fever pneumonia, q.v.), hepatitis, and endocarditis. In humans, it is usually acquired by inhalation of airborne organisms in infected dust or aerosols derived from infected domestic animals, […]
Read more →one of a group of minute infectious agents, with certain exceptions (e.g., poxviruses) not resolved in the light microscope, and characterized by a lack of independent metabolism and by the ability to replicate only within living host cells. Like living organisms, they are able to reproduce with genetic continuity and the possibility of mutation. They […]
Read more →see under encephalitis and virus
Read more →a bacterium of the class Mollicutes.
Read more →a genus of bacteria of the tribe Ehrlichieae, family Rickettsiaceae, order Rickettsiales that produce disease in dogs, cattle, sheep, and humans.
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