Mediterranean spotted fever

Definition

A tick-borne rickettsiosis caused by the bacterium Rickettsia conorii, transmitted primarily by the brown dog tick Rhipicephalus sanguineus, characterized by fever, headache, and a spotted or papular rash often with a distinctive black eschar (tache noire) at the bite site. Endemic to the Mediterranean basin and adjacent regions, with expanding geographic range following the tick's global spread.

Etymology

From Mediterranean (the endemic region) + spotted (referring to the characteristic rash) + fever (systemic symptom); boutonneuse (French, 'pimpled' or 'button-like') describes the papular rash morphology.

Example

Field surveys in southern France found Rhipicephalus sanguineus infected with Rickettsia conorii in urban dog populations, correlating with seasonal peaks of Mediterranean spotted fever cases in humans during summer months.

Synonyms

• boutonneuse fever
• fièvre boutonneuse

Related Terms

• Rickettsia conorii
• Rhipicephalus sanguineus
• Brown dog tick
• tache noire
• rickettsiosis
• tick-borne disease
• medical entomology

Usage Notes

Often used interchangeably with boutonneuse fever in English-language literature, though Mediterranean spotted fever emphasizes geography while boutonneuse fever emphasizes the papular rash morphology. The term is sometimes applied more broadly to related rickettsial infections in the spotted fever group, but specialists restrict it to R. conorii infections. The vector R. sanguineus is a peri-domestic tick closely associated with dogs, distinguishing this disease from tick-borne rickettsioses transmitted by Ixodes or Dermacentor species.