When a disease is spread from one person to another, it is said to be?

The term that best describes a disease that is spread from one person to another is "contagious disease." This definition specifically refers to diseases that can be transmitted through direct contact with an infected individual, such as through body fluids or respiratory droplets.

Contagious diseases are typically caused by infectious agents such as bacteria or viruses that can be easily spread in environments where people are in close proximity to each other. Examples of contagious diseases include the flu, the common cold, and chickenpox. The ability of these diseases to be transmitted from person to person makes understanding this concept crucial for disease prevention and control practices, especially in settings like salons where close physical contact occurs.

While "infectious disease" and "communicable disease" are also related terms, they have broader definitions that encompass a wider variety of transmission methods. An infectious disease refers to any disease caused by pathogens, which may not necessarily spread from person to person. A communicable disease does involve transmission, but it includes a range of contacts, which could be through vectors or other means beyond direct human contact. On the other hand, a chronic disease is one that persists over a long time, often with slow progression, and is not typically transmitted between individuals in the same way.