Lemierre Syndrome

Lemierre syndrome is septic thrombophlebitis of the internal jugular vein after a recent oropharyngeal infection. The usual organism is *Fusobacterium necrophorum*, an anaerobic bacterium that can invade beyond the pharynx, infect the venous wall, and create a clot containing bacteria. Portions of that clot then travel through the right side of the heart and commonly lodge in the lungs as septic pulmonary emboli. The clinical pattern matters more than the initial sore throat. Suspect the syndrome when a person—often a previously healthy adolescent or young adult—has a pharyngitis or tonsillar illness followed within approximately 7–10 days by recurrent high fever, rigors, marked tachycardia, unilateral neck pain or swelling, pleuritic chest pain, dyspnoea, or an unexpectedly toxic appearance. A brief improvement followed by sudden systemic deterioration is particularly concerning. An experienced nurse notices the change from a local infection to a systemic one: the patient is no longer simply reporting throat pain but now has abnormal perfusion, increased work of breathing, worsening oxygenation, or altered behaviour. “Previously healthy” should not reduce urgency. It describes the typical host, not a protective feature....