Teachable Moment

Pitfalls to Procalcitonin—Elevation in a Postvaccine Fever

JAMA Internal Medicine 10.1001/jamainternmed.2026.0673

April 13, 2026 at 11:00 AM EDT

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This case report describes a patient receiving peritoneal dialysis who presented to the emergency department with a fever and elevated procalcitonin levels the day after receiving a COVID-19 vaccine.

Corresponding Author: Virginia H. Sun, MD, Department of Medicine, Massachusetts General Hospital, 55 Fruit St, Boston, MA 02114 (vsun1@mgh.harvard.edu).

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