This summer a Salmonella outbreak traced to contaminated eggs has sickened over 1,000 people and led to the recall of over 500 million eggs. Eggs are particularly susceptible to Salmonella contamination.  The outsides of egg shells can be contaminated by bacteria if they come into contact with chicken droppings or with dirt.  That’s why you should discard cracked or dirty eggs.  The shell itself is fairly resistant to bacteria, but if the chicken is infected with Salmonell...