In crowded places, "you should be wearing a KN95 or N95 mask," which can cost a few dollars each, Wen added. Here's what you need to know about masks like N95s, where to get them and how to use them safely. Why the Omicron variant of coronavirus has been infecting many people so quickly is currently unknown, but it emphasizes the importance of wearing high-quality masks, Bromage said. The difference between N95 and KN95 masks is where each is certified, according to Oklahoma's state health department . Amazon has said it prohibits sellers from claiming their KN95 masks are "FDA-approved," since the US Food and Drug Administration doesn't approve KN95 masks.

Source: CNN January 15, 2022 23:35 UTC