Dr. Penny Adcock is a epidemiologist for the CDC. She informs us how salmonella got into the chicken. See states that 1-in-10,000 to 1-in-20,000 eggs are infected internally with salmonella, when you pool a bunch of infected eggs together or mishandle the suspect eggs, hold them at temperatures conducive to bacterial growth or undercook them. She also states the elderly, expectant mothers, the very young and anybody that has a problem with their immune system avoid over-easy eggs, homemade ice cream, hollandaise sauce, eggnog and Caesar salad.