Many KN95 masks imported from China 'aren’t safe and effective against the spread of COVID-19,” said the president of safety organization ECRI. Hundreds of thousands of the masks have been purchased by U.S. hospitals.
ECRI tested nearly 200 masks from 15 different manufacturer models purchased by some of the largest health systems in the country. Schabacker said there was not only variability among the different brands but also inconsistencies among masks made by the same manufacturer.
Besides the filtration concerns, public health experts criticized KN95 masks for their inability to create a tight seal on someone’s face. N95 masks have head and neck straps; KN95s have ear loops.
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