A Case of Lemierre Syndrome Caused by <i>Prevotella intermedia</i>

Lemierre syndrome is characterized by pyogenic thrombophlebitis of the internal jugular veins following preceding pharyngitis, causing metastatic infection of multiple organs, including the lungs and joints. The most common causative agent is Fusobacterium necrophorum. We encountered a case of Lemierre syndrome caused by the rare pathogen Prevotella intermedia. In addition to thrombosis of the internal jugular vein, septic pulmonary embolism, hepatic vein thrombosis, and thrombocytopenia were present, which improved with intravenous antibiotic and anticoagulation therapy. However, since the internal jugular vein was closed and a thrombus remained in the bulb, continuation of anticoagulation therapy and continued follow-up should be carefully considered.