Is it permissible under current CDC and WHO airborne infection isolation room (AIIR) guidelines for two adjacent AIIRs to share a common anteroom?
In the situation in question, the shared anteroom has two doors. Each anteroom door facilitates transiting to the associated AIIR door. The shared anteroom is equipped with a single exhaust duct. There is no dividing wall in the middle of the anteroom.
A common situation at the hospital in question is that only one of the two AIIRs might be occupied at any given time by a patient on airborne infection precautions (AIP) for ruleout or confirmed TB. This appears to create a couple of potential problems.
First, if the staff leave the anteroom door open to the AIIR that is not being used for AIP, then the pressure differential between the anteroom and the hallway could be lessened (and perhaps even eliminated), thus reducing the function of the anteroom in buffering pressure changes between the hallway and AIIR that is in active use. This in turn could reduce or eliminate the ability of the shared anteroom to capture any fugitive droplet nuclei that could potentially escape from AIIR being used for AIP when staff enter/exit.
The other potential issue is if a shared anteroom could create a patient cohorting issue if the patients in each AIIR are infected with different respiratory pathogens, or if one patient has drug-susceptible TB and the other has MDR-TB?
Thank you in advance for your responses.