Salmonella Enteritidis Causes a Food-Borne Illness That Kills 400 to 600

Multiple Choice

Salmonella enteritidis causes a food-borne illness that kills 400 to 600 Americans each year. It is found mainly in poultry products. Rather than give large doses of antibiotics to poultry, some poultry producers infect the intestinal tract of hens with a harmless bacteria, resulting in a dramatic decrease of S. enteritidis found in the chickens. In this case, what principle did the producers use?

A) mutualism
B) predation
C) competitive exclusion
D) parasitism