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that more than three-quarters of the food-related illnesses and deaths in the United States are caused by infectious agents that have not yet been identified. While medical researchers have gained important insights into the links between modern food processing and the spread of dangerous diseases, the nation’s leading agribusiness firms have resolutely opposed any further regulation of their food safety practices. For years the large meatpacking companies have managed to avoid the sort of liability routinely imposed on the manufacturers of most consumer products. Today the U.S. government can demand the nationwide recall of defective softball bats, sneakers, stuffed animals, and foam-rubber toy cows. But it cannot order a meatpacking company to remove contaminated, potentially lethal ground beef from fast food kitchens and supermarket shelves. The unusual power of the large meatpacking firms has been sustained by their close ties and sizable donations to Republican members of Congress. It has also been made possible by a widespread lack of awareness about how many Americans suffer from food poisoning every year and how these illnesses actually spread.

The newly recognized foodborne pathogens tend to be carried and shed by apparently healthy animals. Food tainted by these organisms has most likely come in contact with an infected animal’s stomach contents or manure, during slaughter or subsequent processing. A nationwide study published by the USDA in 1996 found that 7.5 percent of the ground beef samples taken at processing plants were contaminated with Salmonella, 11.7 percent were contaminated with Listeria monocytogenes, 30 percent were contaminated with Staphylococcus aureus, and 53.3 percent were contaminated with Clostridium perfringens. All of these pathogens can make people sick; food poisoning caused by Listeria generally requires hospitalization and proves fatal in about one out of every five cases. In the USDA study 78.6 per-cent of the ground beef contained microbes that are spread primarily by fecal material. The medical literature on the causes of food poisoning is full of euphemisms and dry scientific terms: coliform levels, aerobic plate counts, sorbitol, MacConkey agar, and so on. Behind them lies a simple explanation for why eating a hamburger can now make you seriously ill: There is shit in the meat.

the national dish

IN THE EARLY YEARS of the twentieth century, hamburgers had a bad reputation. According to the historian David Gerard Hogan, the hamburger was considered “a food for the poor,” tainted and unsafe to eat. Restaurants rarely served hamburgers; they were sold at lunch carts parked near factories, at circuses, carnivals, and state fairs. Ground beef, it was widely believed, was made from old, putrid meat heavily laced with chemical preservatives. “The hamburger habit is just about as safe,” one food critic warned, “as getting your meat out of a garbage can.” White Castle, the nation’s first hamburger chain, worked hard in the 1920s to dispel the hamburger’s tawdry image. As Hogan notes in his history of the chain, Selling ’Em by the Sack (1997), the founders of White Castle placed their grills in direct view of customers, claimed that fresh ground beef was delivered twice a day, chose a name with connotations of purity, and even sponsored an experiment at the University of Minnesota in which a medical student lived for thirteen weeks on “nothing but White Castle hamburgers and water.”

The success of White Castle in the East and the Midwest helped to popularize hamburgers and to remove much of their social stigma. The chain did not attract a broad range of people, however. Most of White Castle’s customers were urban, working class, and male. During the 1950s, the rise of drive-ins and fast food restaurants in southern California helped turn the once lowly hamburger into America’s national dish. Ray Kroc’s decision to promote McDonald’s as a restaurant chain for families had a profound impact on the nation’s eating habits. Hamburgers seemed an ideal food for small children — convenient, inexpensive,