A 40-year-old man is on his fourth day of vacation

in Cambodia when he suddenly develops multiple episodes of watery diarrhoea

accompanied with severe abdominal cramps and nausea. He is afebrile with no

other symptoms.  When the hotel doctor

asked him about his dietary habits in Cambodia, the patient remembered that

during his visit to Angkor Wat he consumed sausages from a nearby street

vendor.

Which infectious agent is most likely the cause of his symptoms?