[Mediterranean spotted fever due to contact with dog-tick].

Mediterranean spotted fever (MSF) is one of the tick-borne rickettsial infections caused by Rickettsia conorii. It is transmitted to humans by brown dog ticks (Rhipicephalus sanguineus). In this case report, a 16-years-old male patient who was diagnosed as MSF after an exposure to dog-tick in Bartin province (located at middle Black Sea region of Turkey) has been presented. His history revealed that, five days before admission to the hospital (on June, 2007) he had cleaned dog-ticks from his dog, and after 12 hours he found a stucked tick on his leg and he took it out right away with a tweezer. High fever, headache and generalized maculopapular rash including soles and palms and a black-colored lesion at the tick bite site developed three days later. In clinical examination, there was a black escar circled with a red-purple colored halo in front of the right tibia at the site of the tick bite showing high similarity to "tache noire" which was specific to MSF. Indirect immunofluorescence assay (IFA) for Rickettsia yielded negative result in the serum sample collected on admission day, however, it was found positive at 1/512 titer in the serum sample collected 10 days after admission. The patient has recovered completely without any complication after 10 days of doxycycline therapy. The aim of this presentation is to point out that MSF should be considered for the differential diagnosis of a patient with a history of tick bite, fever, maculopapular rash, headache, myalgia, arthralgia and especially with black escar during summer months in our country where the incidence of tick-borne infections has been increasing since recent years.