Q. A 35-year-old woman visits your clinic complaining of watery diarrhea, abdominal pain, and a low-grade fever for the past two days. She has been experiencing diarrhea 5 to 6 times per day and it does not contain blood. Her medical history shows recent treatment with clindamycin for bacterial vaginosis two weeks ago. Her temperature is 99°F (37.2°C), pulse is 80 beats per minute, blood pressure is 120/70 mmHg, and respiratory rate is 14 breaths per minute. Physical examination is unremarkable. Given this clinical presentation, what would be the most appropriate next step in her management?