" How contaminated are U.S. pork products? Consumer Reports magazine tested nearly two hundred samples from cities across the country and found that more than two-thirds of the pork was contaminated with Yersinia.129 This may be because of the intensification and overcrowding that characterizes most of today’s industrial pig operations.130 As noted in an article in National Hog Farmer entitled “Crowding Pigs Pays,” pork producers can maximize their profits by confining each pig to a six-square-foot space. This basically means cramming a two-hundred-pound animal into an area equivalent to about two feet by three feet. The authors acknowledged that overcrowding presents problems, including inadequate ventilation and increased health risks, but they concluded that sometimes, “crowding pigs a little tighter will make you more money.”131 "

― Michael Greger , How Not to Die: Discover the Foods Scientifically Proven to Prevent and Reverse Disease