Being in a hospital area previously occupied by someone with a Clostridium difficile infection increases infection risk, according to an article on the Becker's Infection Control & Clinical Quality website.
A recent study analyzed patient encounters in a health system from 2013 through 2015.
The researchers classified a patient as "exposed to C. diff" if they were in an area that had been occupied by a patient with C. diff within 24 hours.
The study shows that exposure to C. diff in the emergency room was connected with the development of the infection.
Ventilation and Filtering for Infection Control 
ChristianaCare Opens Aston Campus Neighborhood Hospital
Stantec Breaks Ground on New Academic Medical Center in Miami
Building Senior Living for the Next Generation of Retirees
Managing Drain and Biofilm Risk