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A fresh tomato is more than just a tasty addition to a sandwich or salad. To scientists at the Food and Drug Administration (FDA), the tomato is an enigma and the focus of a group of researchers nicknamed "Team Tomato." The mystery of the tomato has to do with its vulnerability to contamination by Salmonella, a bacterium that is a common cause of foodborne illness.

Using two-dimensional barcodes on vaccine product labels would enhance the safety of the U.S. immunization system and save more than $300 million by 2023, according to a study by researchers at RTI International and the Centers for Disease Control and Prevention (CDC).