Bob O'Connor, a Foster Farms veterinarian, holds an 11-day-old chick at a ranch near the town of Merced, in California's Central Valley. Dan Charles/NPR hide caption

itoggle caption Dan Charles/NPR

Foster Farms set up new procedures to deal with salmonella contamination after the USDA threatened to shut down its plants last fall. Justin Sullivan/Getty Images hide caption

itoggle caption Justin Sullivan/Getty Images

Pepper is the spice most commonly contaminated with salmonella and other pathogens. iStockphoto.com hide caption

itoggle caption iStockphoto.com

Foster Farms, the chicken processor at the center of a major salmonella outbreak, now faces the threat of a shutdown at its facilities. /PR Newswire hide caption

itoggle caption /PR Newswire

A salmonella outbreak that has sickened more than 270 people has been linked to raw chicken produced at three Foster Farms facilities in California. /PR Newswire hide caption

itoggle caption /PR Newswire

Stewart Parnell (center), former president of the now-defunct Peanut Corp. of America, is one of four executives indicted over a 2009 outbreak of salmonella. Mark Wilson/Getty Images hide caption

itoggle caption Mark Wilson/Getty Images

Farmworkers like these in California picking produce may soon be required by the FDA to take more precautions against spreading foodborne illness. Heather Craig/iStockphoto.com hide caption

itoggle caption Heather Craig/iStockphoto.com