“Acute gastrointestinal illness” means a short duration illness most often characterized by either of the following, which are known to be commonly associated with the agents most likely to be transmitted from infected food employees through contamination of food:
(a) Diarrhea, either alone or in conjunction with other gastrointestinal symptoms, such as vomiting, fever, or abdominal cramps.
(b) Vomiting in conjunction with either diarrhea or two other gastrointestinal symptoms, such as fever or abdominal cramps.