Did you read the article? Apparently you missed a few sentences.
"The NIH said: 'Inclusion in an NLM database does not imply endorsement of, or agreement with, the contents by NLM or the National Institutes of Health.' "
It is a study from South Korea. "The disposable masks were KFAD and KF94 models, which were made from thermoplastics polypropylene and polyurethane nylon....These masks have been popularized in South Korea, where the study was conducted, whereas KN95s are more popular in the US....The team acknowledged that the sample size was small and that they did not test several other popular disposable masks like KN95s."
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In response to this post by Tuckahokie)
Posted: 08/28/2023 at 10:22AM