Bacteria can enter an egg through a crack. If an egg becomes cracked, be sure to use it in a dish that will be cooked thoroughly. Purchase only enough eggs for one or two weeks at a time. Keep eggs in the carton on the refrigerator shelf where it is colder than in the door. Avoid buying dented, rusted or bulging cans.
Bacteria can enter the food through the tiniest of holes or cracks.
Read expiry dates on food packages and choose those you will use before the dates expire. Beware of refrigerator display cases that are over-packed. Never buy foods that normally need to be kept cold, from unrefrigerated counters. Watch for cross-contamination at the meat counter. Use a cooler if you have a long drive or won't be going straight home after shopping.