PHILADELPHIA, PA, September 24, 2020-

Up to 70% of KN95 masks do not meet the U.S. standards for effectiveness, according to a new study by ECRI, a Pennsylvania-based patient safety organization.

The findings suggest an increased risk of contracting COVID-19 for health-care workers and patients at hospitals that imported the masks from China to deal with massive shortages of protective equipment during the early days of the pandemic. (N95 masks meet the U.S. standards for effectiveness.)

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