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E. Coli. Eating undercooked ground beef is one of the main causes of E. coli, which can cause symptoms including diarrhea, vomiting and stomach cramps. These symptoms usually occur between two and eight days after eating contaminated food and can last for up to a week.
1 When cattle are slaughtered and processed, E. coli bacteria in their intestines can get on the meat. Ground beef combines meat from many different animals, increasing the risk of contamination.  Unpasteurized milk. E. coli bacteria on a cow's udder or on milking equipment can get into raw milk.