Which term describes the spread of disease from person to person?

• A. Infectious Disease
• B. Communicable Disease
• C. Pathogens
• D. Chain of Infection

Answer: (D)

How disease spreads from one person to another is described by the Chain of Infection. This framework outlines the steps that allow transmission: the infectious agent (pathogen) exists, it has a reservoir, there is a portal of exit, it can be transmitted to a new host, there is a portal of entry, and a susceptible host is exposed. In practice, breaking any one of these links stops the spread—cleaning and disinfecting surfaces reduces reservoirs, wearing gloves or masks interrupts transmission, hand hygiene minimizes exit and entry points, and isolating sick individuals removes the host from exposure. That’s why this term best captures the process of person-to-person spread. The other terms describe disease in different ways—an infectious disease is caused by pathogens; a communicable disease can be transmitted between people, and pathogens are the organisms that cause disease—without detailing the step-by-step transmission that the chain of infection encompasses.