Dario Sabljak/Shutterstock Methicillin-resistant Staphylococcus aureus (MRSA) , one of the most dangerous antibiotic-resistant bacteria, is responsible for more than 250,000 hospitalizations a year in the United States alone. And new, even more deadly versions of staph may be on the way, due to intensive use of antibiotics on factory farms. In February scientists reported that a methicillin-susceptible staph had jumped from people to industrially farmed pigs, acquired resistance to the antibiotics the pigs were fed, and jumped back again, having turned methicillin-resistant. The newly minted...