Rising Covid cases have spurred a return to mask-wearing in the U.S. and overseas, at a time when flawed KN95s from China continue to dominate e-commerce sites.

But good luck buying them online or at big box retailers.

Consumers who try to purchase N95 masks, mainly on Amazon, are often led to vendors selling fake or poorly made KN95s, a Chinese-made mask that is often marketed as an N95 equivalent despite the lack of testing by U.S. regulators to confirm virus-filtering claims.

In fact, KN95 masks offered on Amazon and through other retailers are being sold without authorization for use in health care settings from the Food and Drug Administration, which last July revoked its emergency use authorization for imported masks that lack approval from the Centers for Disease Control and Prevention — a category that includes all KN95s from China.

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