Introduction to Epidemiology and Concepts of Infectious Disease Practice Test

Acute versus chronic infectious diseases are differentiated by how quickly symptoms appear and how long the infection lasts. An acute infection starts with a rapid onset of noticeable symptoms and resolves in a short time, usually days to weeks. A chronic infection persists for a much longer period—months or years—and the person may have ongoing illness or even feel healthy at times, since the infection can be asymptomatic for periods or only intermittently active.

This is why the best description is that acute disease has rapid onset and short duration, while chronic disease persists longer and may be asymptomatic. Other patterns described in the alternatives don’t fit the usual course: acute infections aren’t typically long in duration, chronic infections aren’t required to be rapidly starting, and not all acute infections are asymptomatic or all chronic infections are always symptomatic.