Vikram Kaur presents to the emergency department with 24 hours of nausea, vomiting, abdominal cramps, and diarrhea. He is 23 years old, has no significant medical history, and is not taking any medications or supplements. His vital signs are as follows: T 37.4°C, HR 110 bpm, RR 16 breaths per minute, BP 105/70 mmHg, SaO2 97% on room air. His girlfriend, Jasmine, is accompanying him and informs you that she experienced similar symptoms a day or so ago, although not as severe, and currently feels fine.
What do you think is wrong with Vikram? What information leads you to this conclusion, and how would you assess this?