Typhus, tick
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.

Medical dictionary. 2011.

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  • Tick fever — 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.… …   Medical dictionary

  • 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

  • typhus — typhous, adj. /tuy feuhs/, n. Pathol. an acute, infectious disease caused by several species of Rickettsia, transmitted by lice and fleas, and characterized by acute prostration, headache, and a peculiar eruption of reddish spots on the body.… …   Universalium

  • 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.… …   Medical dictionary

  • Tick-borne rickettsioses of the eastern hemisphere — There are 3 known diseases caused by infection with rickettsial agents. They are North Asian tick borne rickettsiosis, Queensland tick typhus, and African tick typhus (fičvre boutonneuse) …   Medical dictionary

  • typhus — spotted fever; n. any one of a group of infections caused by rickettsiae and characterized by severe headache, a widespread rash, prolonged high fever, and delirium. They all respond to treatment with chloramphenicol or tetracyclines. Epidemic… …   The new mediacal dictionary

  • tick — An acarine of the families Ixodidae (hard ticks) or Argasidae (soft ticks), which contain many bloodsucking species that are important pests of humans and domestic birds and mammals, and that probably exceed all other arthropods in the number and …   Medical dictionary

  • tick — n. a bloodsucking parasite belonging to the order of arthropods (the Acarina) that also includes the mites. Tick bites can cause serious skin lesions and occasionally paralysis (see Ixodes, Amblyomma), and certain tick species transmit typhus,… …   The new mediacal dictionary

  • Tick bite — A bite from a bloodsucking, parasitic insect that punctures the skin with a sharp beak. The tic burrows into the skin with its head. Tick bites can carry serious illness, including Rocky Mountain spotted fever, other forms of tick typhus, and… …   Medical dictionary

  • Typhus, African tick — 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

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