Nursing Students in an Enclosed Classroom Begin to Become Ill

Nursing students in an enclosed classroom begin to become ill with a gastrointestinal illness. The public health department identifies this occurrence as an emerging epidemic and isolates the population that is ill. Which factor will become apparent among those who survive this disease?

A) Recover with adaptive organism reintroduction into the environment
B) Develop improved defenses against reinfection
C) Become hosts to the organism, which is symbiotic in nature
D) Become carriers of the infection, ultimately leading to an epidemic