I eat out less and less for this very reason. One doesn’t know who is touching one’s food back in the kitchen. When I travel, I pack my own food. The only thing I buy is that night’s wine. Many times I even take my own with me.
Think of who works behind your supermarket deli and meat counters. Got the same risks here too. the gal who makes the macaroni salad or shreds the deli meat, the guys grinding up the hamburger special of the week, same potential thing here too.