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A 17-year-old male patient presents to the outpatient department for an annual routine evaluation in November. He has no active complaints. The patient has a past medical history of gastroesophageal reflux disease, for which he takes famotidine. His last vaccinations included a tetanus-diphtheria toxoid booster four years ago. The patient does not smoke or drink alcohol. Vitals show a blood pressure of 125/75 mmHg, a pulse of 77/min, a respiratory rate of 13/min, and a temperature of 98.6 F (37 C). No abnormalities are seen on physical examination. No abnormalities are seen in laboratory and radiological investigations. It is decided to administer a vaccine against a viral illness. Which of the following is a possible contraindication to the administration of the vaccine?

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