Mask Reuse and Extended Mask Use:
• There is no way of determining the maximum possible number of safe reuses for an N95 respirator as a generic number to be applied in all cases.

• For mask reuse, preliminary data suggests limiting the number of reuses to no more than five uses per device to ensure an adequate safety margin.

• For extended mask use, respirators can function within their design specifications for 12 hours of continuous or intermittent use.

• Therefore, the recommendation for staff is to limit reuses to no more than five uses, or extend mask use for up to 12 hours, whichever is shorter.

• Keep respirators in a clean, breathable container such as a paper bag between uses. To minimize potential cross-contamination, store respirators so that they do not touch each other and the person using the respirator is clearly identified. Storage containers should be disposed of or cleaned regularly.

References:
https://www.cdc.gov/niosh/topics/hcwcontrols/recommendedguidanceextuse.html
https://www.cdc.gov/coronavirus/2019-ncov/hcp/respirators-strategy/crisis-alternate-strategies.html
Fisher, E.M., and R.E. Shaffer. Considerations for Recommending Extended Use and Limited Reuse of Filtering Facepiece Respirators in Healthcare Settings. Journal of Occupational and Environmental Hygiene. 2014; 11: D115-28
Bergman, M.S., D.J. Viscusi, Z. Zhuang, A.J. Palmiero, J.B. Powell, and R.E. Shaffer. Impact of multiple consecutive donnings on filtering facepiece respirator fit. American Journal of Infection Control. 2012; 40(4): 375-380.

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