Having a July 4th cookout? Follow these food tips to make sure your guests don't go home sick Listeria, E. coli and salmonella are always a concern when cooking for a lot of people. The health department offers these tips to keep your friends and family safe. Author: Vinay Simlot Updated: 6:08 PM EDT July 2, 2021 KNOXVILLE, Tenn. — Many people will be gathering this weekend for Fourth of July cookouts, and the Knox County Health Department has tips to keep guests safe. Allison Rosenberg manages the food division at the Knox County Health Department. Rosenberg recommends washing hands frequently and cleaning frequently used surfaces.