Food safety: emerging trends in foodborne illness surveillance and prevention.

Between 250 and 350 million Americans are estimated to suffer acute gastroenteritis annually, with 25% to 30% thought to be caused by foodborne illnesses. Most vulnerable to foodborne diseases are elderly people, pregnant women, immune-compromised people, and children. While bacterial causes such as Salmonella are widely recognized and monitored as foodborne infections, other important bacterial causes such as Clostridium perfringens , Bacillus cereus , and Staphylococcus aureus are less well known. While the majority of cases of foodborne diseases are of unknown cause, bacteria and viruses are the most likely causative agents. Caliciviridae (Norwalk-like) virus cases are more difficult to identify, but represent the most common cause of known and probably unknown cases. Fresh produce has to be added to the traditional list of foods requiring careful selection and handling to prevent foodborne disease. To assess the disease burden in the United States, morbidity and mortality surveillance activities are done by several networks and systems with collaboration among federal agencies and health departments. Not all important causes are being equally monitored. Critical behaviors by food processors, food retailers, foodservice personnel, and consumers can reduce the risk of foodborne illness episodes. Dietetics professionals can more readily monitor new developments and update knowledge and practice through online resources.