How would you classify an infection that can spread from person to person?

An infection that can spread from person to person is classified as contagious. This term specifically refers to infections that are easily transmitted through direct or indirect contact with an infected individual, allowing the pathogens responsible for the infection to spread in populations. Contagious diseases are typically associated with transmission via respiratory droplets, physical contact, or contaminated surfaces, making them a significant public health concern.

In contrast, the other classifications mentioned serve different purposes: localized infections are confined to a specific area of the body; chronic infections persist over a long time, often causing gradually worsening symptoms; and acute infections appear suddenly and are usually of short duration but can be severe. Recognizing the contagious nature of certain infections helps in implementing necessary precautions to prevent outbreaks and protect public health.