Case reportA 30-year-old Tunisian woman, without pathological medical history, was hospitalized via the emergency department for exploration of a meningeal syndrome. The history of his illness dates back two days before his hospitalization, by the appearance of headaches with fever and vomiting not improved by the symptomatic treatment. The somatic examination found a patient conscious, well oriented, without focal neurological deficit, feverish at 39°C, significant stiffness of the neck, with photophobia, sonophobia, and multiple cervical adenopathies slightly sensitive. The ENT and bucco-dental examination were without abnormalities. The biology showed leukocytosis at 15 600/mm 3 with 85% neutrophils, a marked biological inflammatory syndrome with a high erythrocyte sedimentation rate at 135mm/H1, a C-reactive protein at 28 mg/l and a hyperfibrinemia at 8 g/l. The other basic bioassays were without abnormalities: hemoglobin, platelets, blood glucose, serum