Which statement best describes the difference between infectious and chronic diseases?

• A. Short duration, contagious, unifactorial origin
• B. Long duration, outcome varies, multifactorial origin or undetermined, not contagious
• C. Non-communicable and acute
• D. Always fatal within a year

Answer: (B)

Long-lasting, multifactorial conditions that aren’t spread from person to person are the key features distinguishing chronic diseases from infectious ones. Chronic diseases persist over time, with outcomes that can vary between individuals and over the course of the disease. Their causes are usually multiple and may be unknown or undetermined, reflecting a complex interplay of genetics, environment, lifestyle, and other factors. Because they are not transmitted between people through close contact or contagious agents, chronic diseases are typically non-communicable.

This description captures that contrast: long duration, variable outcomes, multifactorial or uncertain origins, and lack of contagiousness. In contrast, infectious diseases often involve a pathogen, have potential for transmission, and can be acute or short-lived; some can be chronic, but contagion is a defining feature of many infectious illnesses.