Filtering out airborne bacteria.
D000391:Air Microbiology; D016902:Air Pollution, Indoor; D001424:Bacterial Infections / Q000517:prevention & control; D005374:Filtration; D017408:Guidelines as Topic; D006749:Hospital Design and Construction; D006801:Humans; D017053:Infection Control / Q000295:instrumentation / Q000379:methods*; D006113:United Kingdom; D014691:Ventilation / Q000295:instrumentation