Rocky Mountain spotted fever

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Related to spotted fever: Mediterranean Spotted Fever

Rocky Mountain spotted fever,

infectious disease caused by a rickettsiarickettsia
, any of an order (Rickettsiales) of very small microorganisms, many disease-causing, that live in vertebrates and are transmitted by bloodsucking parasitic arthropods such as fleas, lice (see louse), and ticks.
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. The bacterium is harbored by wild rodents and other animals and is carried by infected ticks of several species that attach themselves to humans. Despite its name, Rocky Mountain spotted fever is most prevalent in the S United States from Virgina, the Carolinas, and Georgia W to Oklahoma; it may be encountered in other tick-infested regions. Symptoms include chills and high fever; a rose-colored skin rash that appears first on the wrists and ankles and spreads to the trunk, the spots turning deep red and running together; headache; and pains in the back, muscles, and joints. In severe cases there may be delirium or coma. Spotted fever is a serious disease; however, it is not usually fatal if antibiotic treatment (usually doxycycline) is administered promptly.

Rocky Mountain Spotted Fever


an acute infectious disease of man, of the group of rickettsioses. A naturally endemic disease, it is encountered in the western hemisphere.

Rocky Mountain spotted fever is usually observed in spring and summer. The causative agent is transmitted by ticks from generation to generation; other reservoirs of the virus include rodents and dogs. The disease develops within two to 14 days after the tick bite. The causative agent may also reach the skin and mucosa when the tick is crushed. The disease is manifested by high fever (39° to 41 °C) and a spotty nodular rash that appears on the second to fifth day. Other symptoms are headache, nausea, vomiting, pains in the bones and muscles, restlessness, and insomnia.

Rocky Mountain spotted fever is treated with antibiotics and oxygen therapy. It is prevented by avoiding tick bites and by disinsectization and immunization.

Rocky Mountain spotted fever

[′räk·ē ′mau̇nt·ən ′späd·əd ′fē·vər]
An acute, infectious, typhuslike disease of man caused by the rickettsial organism Rickettsia rickettsi and transmitted by species of hard-shelled ticks; characterized by sudden onset of chills, headache, fever, and an exanthem on the extremities. Also known as American spotted fever; tick fever; tick typhus.
References in periodicals archive ?
The American Dog Tick (Dermacentor variabilis) feeds on dogs and humans and can spread Rocky Mountain spotted fever.
Rocky Mountain spotted fever from an unexpected tick vector in Arizona.
Tidewater spotted fever, also known as Rickettsia parkeri rickettsiosis or American boutoneuse fever, has been a recently described human disease even though the causative agent, R parkeri, has been known since its isolation in 1937.
Table 1--Mediterranean spotted fever malignant forms: risk factors for fatal outcomes.
Spatial clustering by disease severity among reported Rocky Mountain spotted fever cases in the United States, 2001-2005.
Rickettsial Infections in South India-how to spot the spotted fever.
Severe cases of Mediterranean spotted fever can present with atypical signs.
antibodies in domestic chicken (Gallus gallus domesticus) from extensive breeding farms and verify epidemiological significance as reservoir and/or amplifying hosts of the etiological agent of spotted fever in an area considered endemic for BSF in Rio Grande do Sul state (RS), Brazil.
Doxycycline is the first-line agent used for treatment of Rocky Mountain spotted fever in children of all ages.
Among the major outer membrane surface proteins are OmpA and OmpB which are present in the Rickettsial Spotted Fever Group and the Transition Group, while the Typhus Group Rickettsia only have OmpB and his cellular receptor still unknown.
Asummary of investigations of the nature and means of transmission of Rocky Mountain spotted fever.
rickettsii causing rocky mountain spotted fever in Mexico, Costa Rica, Panama, Colombia, Brazil and Argentina; R.