Tick typhus
Also known as Rocky Mountain spotted fever, an acute febrile (feverish) disease initially recognized in the Rocky Mountain states, caused by Rickettsia rickettsii transmitted by hard-shelled (ixodid) ticks. Occurs only in the Western Hemisphere. Anyone frequenting tick-infested areas is at risk for RMSF. The onset of symptoms is abrupt with headache, high fever, chills, muscle pain. and then a rash .The rickettsiae grow within damaged cells lining blood vessels which may become blocked by clots. Blood vessel inflammation (vasculitis) is widespread. Early recognition of RMSF and prompt antibiotic treatment is important in reducing mortality. The first person to describe the disease was an ear, nose and throat specialist, Edward Ernest Maxey. Maxey reported the disease in 1899. Seven years later, a pathologist named Howard Taylor Ricketts showed that it was transmitted by a tick bite. The agent that causes the disease was named for him — Rickettsia rickettsii. Rocky Mountain spotted fever is also called spotted fever and tick fever.

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tick typhus n any of various tick-borne rickettsial spotted fevers (as Rocky Mountain spotted fever or boutonneuse fever)

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tick-borne typhus see under 1. fever. 2. spotted fever.

Medical dictionary. 2011.

Look at other dictionaries:

  • tick typhus — noun : a disease that occurs in widely separated areas in Asia, Australia, Africa, Siberia, and Europe and is caused by the bite of a tick …   Useful english dictionary

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  • Indian tick typhus — n a disease of India that is caused by a tick borne member of the genus Rickettsia (R. conorii) and is prob. identical with or closely related to boutonneuse fever * * * Israeli tick typhus boutonneuse fever …   Medical dictionary

  • Queensland tick typhus — One of the tick borne rickettsial diseases of the eastern hemisphere, similar to Rocky Mountain spotted fever, but less severe, with fever, a small ulcer (eschar) at the site of the tick bite, swollen glands nearby (satellite lymphadenopathy),… …   Medical dictionary

  • African tick typhus — One of the tick borne rickettsial diseases of the eastern hemisphere, similar to Rocky Mountain spotted fever, but less severe, with fever, a small ulcer (tache noire) at the site of the tick bite, swollen glands nearby (satellite… …   Medical dictionary

  • North Asian tick typhus — a mild type of spotted fever, characterized by high fever, headache, malaise, conjunctival injection, a maculopapular rash, and a primary ulcerative lesion at the site of the tick bite. Besides Siberia, it has also been observed in Central and… …   Medical dictionary

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  • typhus — A group of acute infectious and contagious diseases, caused by rickettsiae that are transmitted by arthropods, and occurring in two principal forms: epidemic t. and endemic (murine) t.; typical symptoms include: severe headache, shivering and… …   Medical dictionary

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