A study appearing in the New England Journal of Medicine this week, links antibiotics in livestock feed to human illness.
Researchers in Taiwan say they've traced a rapid emergence of drug-resistant salmonella bacteria to pigs.
The scientists claim farmers hope to control disease and promote growth by feeding the pigs antibiotics.
According to the study, salmonella resistant to an entire class of antibiotics called fluoroquinolones can spread from swine to humans. The researchers are calling for a ban on the use of fluoroquinolones in food animals.