Background: Mediterranean spotted fever is an endemic rickettsiosis in southern France. We report here the case of a 2-month-old baby who developed rickettsiosis after a tick bite. A 2-month-old baby was hospitalized in the pediatric ward for fever with maculopapular rash extending to the palms and plantar surfaces and an eschar after a tick bite. Rickettsiosis serology examined after 48 h of fever was negative, but Rickettsia (spotted group) PCR taken from the lesion at the bite site was positive. A 1-week treatment with clarithromycin was started. Fever and rash disappeared 3 days after treatment initiation.

Conclusions: Mediterranean spotted fever is endemic in southern France. It is, therefore, important to consider this diagnosis and search for tick bite signs or an eschar when a patient presents with fever and maculopapular rash. The treatment of choice consists in doxycycline or macrolides. Conclusions: Around the Mediterranean sea in particular, Mediterranean spotted fever should be considered as a possible cause of febrile disease with rash, to allow for a specific antibiotic treatment as fast as possible and to avoid dangerous complications, even though few cases have been reported below the age of 3 months.