Public-health workers know that trichinosis could be virtually wiped out if the feeding of uncooked garbage to pigs could be stopped. But using cooked garbage is an expensive proposition, and hog farmers have long refused to comply. Meanwhile, an average 350 U.S. citizens fall ill and 13 die each year from trichinosis.
This year hog farmers finally took action. Reason: vesicular exanthem, a disease of hogs that, unlike trichinosis, is not transmissible to human beings. Reports the University of Michigan's Professor Arthur Dearth Moore in the A.M.A. Journal: "This virus disease spread in the...