Infection and Response Practice Test

Communicable diseases are defined by their ability to be passed from one person to another. That means there is a pathway for transmission, whether through direct contact, respiratory droplets, contaminated food or water, or via a vector or shared environment. Because transmission between people is possible, such diseases are considered communicable. The other statements imply there is no transfer between people or that the disease isn’t infectious, which contradicts the core idea of communicable diseases. For example, flu can spread from one person to another through droplets, illustrating this transfer clearly.