Here at Food Safety News, we also reported on the study. The group’s testing of 198 pork samples, 148 of which were pork chops and 50 of which were ground pork, found relatively low levels of contamination for the bugs that regularly make headlines, like Salmonella and Listeria monocytogenes, but a whopping 69 percent of these samples were positive for Yersinia enterocolitica, which can also make people sick.