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This estimate has been the basis of [WHO.sup.2] specifying for natural ventilation a minimum hourly averaged ventilation rate of 160 L/s (339 cfm) per patient for airborne precaution rooms (with a minimum of 80 L/s [170 cfm] per patient).
Airborne precautions should be adhered to when performing any aerosol-generating procedure.
Airborne Precautions are used for patients with known or suspected infections, such as TB, measles, and chickenpox, that can be spread through the air within a room or over a long distance.
Patients with suspected TB (eg, hospitalized patients in airborne precautions) were prospectively enrolled at 7 sites, and at each site, a physician estimated the probability that the patient had TB.[19] In addition, 3 physician experts in diagnosis and management of TB reviewed cases that were not "proven TB" (defined as [is greater than] 80% chance of TB by the enrolling physician and [is greater than or equal to] 22 cultures positive for MTBC), or "TB excluded" (defined as [is less than] 10% likelihood of TB by enrolling physician and all cultures negative for MTBC).
Transmission-Based Precautions, which include Airborne Precautions, Droplet Precautions and Contact Precautions, are for patients with documented or suspected contagious pathogens.
Droplet precautions should be added to the standard precautions when providing care to patients with symptoms of acute respiratory infections; contact precautions and eye protection should be added when caring for probable or confirmed cases of MERS-CoV infection; airborne precautions should be applied when performing aerosol generating procedures.

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