This apple-topped salad is one of several products being recalled for potential contamination with the bacteria Listeria monocytogenes Ready Pac, Inc. hide caption

itoggle caption Ready Pac, Inc.

Tomatoes getting a splash of water reinforces the notion that McDonald's food is wholesome in China, as seen in this video screengrab. McDonald's China hide caption

itoggle caption McDonald's China

Miller Farms in Maryland is a family-run operation that sells its home-grown vegetables at farmers' markets and local grocery stores. Phil Miller, whose family owns the farm, says he's trying to earn a food safety certification now required by many food buyers. Maggie Starbard/NPR hide caption

itoggle caption Maggie Starbard/NPR

A clampdown on contamination in growing fields has pushed out wildlife and destroyed habitats. Adam Cole/NPR hide caption

itoggle caption Adam Cole/NPR

A worker monitors the loading of containers on to a ship at a harbor in China's Shandong province. Under a new U.S. law, Chinese food exporters will now have to share more food safety information with American food importers. STR/AFP/Getty Images hide caption

itoggle caption STR/AFP/Getty Images

An oyster shucker on Samish Island, Wash. on Puget Sound. The state is frequently forced to close beaches to oyster gatherers because of the risks of harmful algae blooms. Ted S. Warren/AP hide caption

itoggle caption Ted S. Warren/AP

Lean finely textured beef, made by Beef Products Inc., shown before packaging. AP/Beef Products Inc. hide caption

itoggle caption AP/Beef Products Inc.

Beef on display at a new Wal-Mart store in Chicago. The retailer announced it will offer consumers meat that does not contain lean finely textured beef. John Gress/Reuters /Landov hide caption

itoggle caption John Gress/Reuters /Landov