Nine of them were taken to rushed to Pattaya Hospital suffering from dizziness, vomiting, chest pains and dehydration.
Twenty otherss suffered from diarrhea. They were given anti-biotic and anti-dehydration solution without being taken to hospital.
The affected people were among 140 public health officials from around the country who participated in a seminar at the Aiyara Pattaya Hotel from Wednesday to Friday.
FoodWorld 