Got stomach bug after eating their food

At around 11am (29-09-2015) my colleagues bought cooked pap, beef stew and boerewors. I shared the food with my colleagues in the office. <br> <br> On the same night, I experienced some discomfort and I had a diarrhea. This went on the whole night until the early hours of the next morning. <br> <br> The next day at work, I enquired from the same colleagues if they did not experience any problems the previous night? All of them had the same problems. One went as far as to get a severe injury on her behind. She was even vomiting.<br> <br> If all of us shared the same meal and we all had diarrhea, it is obvious that the culprit has to be either the pap or the beef stew or the boerewors.<br> <br> <br> <br> <br>