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A 20-month-old baby is brought by his parents to the clinic with complaints of fever and multiple episodes of diarrhea. He has also been having vomiting for one day. His vitals include a temperature of 99 F (37.2 C), a pulse rate of 122 bpm, a blood pressure of 90/50 mmHg, and a respiratory rate of 34 breaths/min. The physical examination does not reveal any significant findings. He has a Hb level of 11.5 g/dl, a TLC of 8500/mm3, and a platelet count of 400,000/mm3. Liver function tests show bilirubin of 0.4 mg/dl (normal 0.2 mg/dl to 1 mg/dL), alanine aminotransferase (ALT) of 36 (normal 5 IU/L to 45 IU/L), aspartate aminotransferase (AST) of 54 IU/L (normal 9 IU/L to 80 IU/L), and an alkaline phosphatase level of 188 IU/L (normal 150 IU/L to 420 IU/L). Electron microscopic studies of the stool sample reveal double-stranded non-enveloped RNA viruses. Which of the following would help best with the diagnosis in this patient?

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