Is the incidence of influenza less in healthcare personnel wearing N95 respirator masks than those wearing standard medical/surgical masks?
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Why is this study important?
N95 respirators are designed to prevent inhalation of small airborne particles such as viral respiratory infections, and in many institutions, their fit and use are often required of healthcare personnel (HCP) for continued employment. Compared with medical/surgical masks, the cost, fit, and availability of N95 respirators may limit their use in clinical practice.
Which, if any, threats to validity are most likely to have an impact on the results and how?
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