| http://www.w3.org/ns/prov#value | - Because the effectiveness of respiratory protection depends on a good mask-to-face seal, OSHA requires disposable respirators to be thrown away after each use and other respirators to be undergo afit test annually to ensure the fit is acceptable.One report on the SARS outbreak indicates that although EMS providers who were exposed to SARS were wearing appropriate PPE, they had not been fit-tested
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