Salmonella can ride water into tomatoes

In this June 10, 2008 file photo, a worker separates tomatoes at the sprawling Central de Abastos market in Mexico City. Pick a tomato in the blazing sun and plunge it into cold water. Instead of cleaning it, you might have contaminated it. As the FDA painstakingly tracks the source of the nationwide salmonella outbreak, this example shows the farm isn't the only place tomatoes can become tainted _ and checking things like water quality and temperature control in packing houses and other supply stops is one key to safety. (AP Photo/Gregory Bull, File)