Rickettsiosis is a zoonotic bacterial infection transmitted to humans by several arthropods. Clinical manifestations of the disease range from mild, self-limiting illness to life-threatening multivisceral failure. Severe" is defined as presenting clinical and/or biological criteria indicating life-threatening organ dysfunction. These may include neurological, renal, cardiac, respiratory, digestive, ocular, haematological or thrombo-embolic disorders. The diversity of serious manifestations of rickettsial disease can lead to delays in diagnosis and even treatment, resulting in a poor prognosis...