1 MCQs in Pediatrics for NEET PG
A 5-year-old boy presents to the emergency department with a 3-day history of jaw stiffness, difficulty opening his mouth, and a characteristic "sardonic smile." His mother reports he sustained a puncture wound to his foot from a rusty nail 10 days ago. On examination, the structure marked **A** in the diagram is evident. Which of the following best explains the pathophysiological mechanism underlying this clinical sign?
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