Which of the following groups is considered to be part of a high-risk population for foodborne illnesses?

Preschoolers are considered part of a high-risk population for foodborne illnesses due to their developing immune systems and smaller body size, which makes them more vulnerable to pathogens and foodborne pathogens' effects. Children in this age group are more likely to experience severe consequences from foodborne illness compared to healthy adults, as their ability to fight infections and recover from illnesses is not fully developed.

In contrast, healthy adults generally have robust immune systems that can effectively handle common pathogens, while elderly individuals, despite their health status, often experience a decline in immune function, making them more susceptible as well. Traveling tourists, although they may face exposure to unfamiliar foods and environments, do not universally represent a high-risk group compared to young children.