By lunch your sandwich is thawed, yet cold enough to prevent bacteria from growing. Do not taste or use foods with a foul odor or any food from a can that spurts liquid when you open it. These foods could contain the rare and often fatal botulism poison. If you keep germs off meat, poultry, and dairy products, you avoid problems. Clean utensils, platters, hands, and countertops with soap and hot water.
Germs are a natural part of the environment.
You must keep washing them off things, especially off your hands. Do not handle food if you have infected cuts or sores. Even if you are in a hurry, always cover any sore carefully before handling food. Be careful you do not spread germs from raw meat to cooked meat. If you carry raw hamburgers to the grill on a platter, wash the platter before putting the cooked hamburgers on the platter.