Welcome to the party, Victorians! Food born contaminant illness has become all too common here in the US over the past few years. Generally they end up tracing it back to the farm where the produce came from. Either from using contaminated water for irrigation, improperly sterilized processing equipment, or plain old unsanitary interaction between human workers and the food, it's tough to think of any food as being safe anymore. In this case, it sounds like somebody at the drying facillity isn't washing the tomatoes properly.