A 40-year-old man presents to the clinic with acute onset nausea, vomiting, and watery diarrhea for the past 24 hours. He attended a company picnic two days ago where he consumed various foods, including sandwiches and seafood. He denies fever or abdominal pain but reports feeling fatigued. Physical examination reveals mild dehydration and normal vital signs.What is the most likely mode of transmission for the causative agent in this patient?
