I recalled those events because of this eDiet Health Tip from My Yahoo:
Food poisoning can be downright deadly. Before handling raw poultry, seafood, meat or eggs, always wash your hands in hot, soapy water. Check to see that your refrigerator's thermostat is set to 40 degrees or below. Do not thaw foods at room temperature, but rather defrost them in the refrigerator. Wash the cutting board with hot, soapy water when using it for a variety of foods.
And I add: Always reheat thoroughly leftover foods that were refrigerated prior to consumption, especially if they had been cooked or prepared more than 12 hours. For mayonnaise- or egg-containing food like salad or some frosting, consume as fast as you can and keep refrigerated. If they had been sitting at room temperature for more than 2 hours, throw them away unless you intend to reheat them (I especially like toasting bread with mayo-egg or mayo-cheese using the oven-toaster).
To give you more information on Food Poisoning, read this page from the Merck Manual website.
You may also look at the US FDA website on the said topic, particularly for those etiologic/causative agents not mentioned in the Merck Manual.
If you happen to have the symptoms, be prepared to recall where you last ate and what items you had. So if you happen to eat at restaurants often, keep the receipts within at least 2 weeka. You may have to use them.