Final answer:
Teenagers are not considered highly susceptible to food-borne illnesses.
Step-by-step explanation:
The group of people who are NOT considered "highly susceptible" to food-borne illnesses are teenagers. While young children, the elderly, and immunocompromised/sick people are at a higher risk of food-borne illnesses due to their weaker immune systems, teenagers generally have stronger immune systems that can better fight off infections.
Learn more about food-borne illnesses