Hello Dr. Lew. This is going to be a gigantic issue when the stay at home order is lifted. I expect that there will be another shortage of respirators, especially outside of the big hospitals. Technically, no product is allowed to have FDA logos on it anywhere. Some Chinese companies have taken the liberty to do this, but Chinese customs have been stopping these from being exported. Not all KN95 are bad, nor are the ones with the FDA logo. I recommend that you conduct a fit test, before using them in your clinical practice. Thank you.