Every year, around 600 million people are struck down by foodborne illnesses. The culprits are often common yet dangerous bacteria, such as E. coli and Salmonella, that thrive in undercooked or improperly handled food. These pathogens are a particular concern in ready-to-eat (RTE) products and have caused numerous food recalls. But these widespread risks could be a thing of the past thanks to the invention of microneedle patches that inject bacteria-killing viruses into food.