Transmission-based precautions are followed
A. when a patient is known to have a particular infectious disease.
B. with every patient to protect against possible infectious agents.
C. to identify diseases that can be transmitted.
D. to track the passing of an infectious disease.

Respuesta :

A.
Because they need to prevent other patients from getting the diease, also if the diease is fatal and can spread to others.

Hope this helped!!! :)
-Ginger