Regarding ventilation there are more severe requirements in the medical public buildings for air indexes especially for humidity and air quality. It depends on a drop in the immunity and necessity to relieve the pressure on the patients for their speedy recovery.
Only support facilities ventilation can be without additional cleaning. The rest types of the facilities (including standard rooms and treatment rooms) need to be provided with an air quality index of no more than 1000 CFU/m3 and to consider the airborne microorganisms from both healthy and infected people. This index must be lower in the special medical facilities (operating rooms and others).
Humidity is another air quality index. To avoid mucous membranes drying out and to allow dust to settle effectively it is necessary to provide the buildings with minimum humidity in winter.