This tool supports structured infectious-disease decision making but does not replace clinician judgement or local guideline pathways.
This OpiCalc infectious-disease entry reflects commonly used guideline criteria and bedside risk features used in contemporary clinical practice.
Lemierre Risk Flags: Warning signs for Fusobacterium necrophorum infection and septic thrombophlebitis after pharyngitis.
Unilateral neck swelling/pain
+2 Points
Toxic appearance or septic physiology
Recent severe pharyngitis
+1 Points
Pulmonary septic emboli symptoms
Internal jugular tenderness
Young adult with rapidly worsening course
Assessment Tier
Score 0
Classic Lemierre red flags are limited.