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Virus experts returned to theneed masks In recent months, with the propagation of the highly transmissible delta variant complicates the situation. In July, the disease control and prevention centers (CDC) made a major inversion of its mask guide, recommending that individuals vaccinated are once again in interior spaces. The current variant of COVID is so contagious that many experts have even recommended that the general publicDON N95 respirators, which were largely reserved for health workers during the height of the pandemic.

"Mask quality will make a difference with a variant that spreads more aggressively as Delta, where people are more contagious and exuded more viruses, and try to get N95 masks in the hands of vulnerable people in places where this is really epidemic, I think will be important, even in cases where they are vaccinated "Scott Gottlieb, MD, former Commissioner of the Food and Drug Administration (FDA), told CBS News. But despite the added protection, these masks provide, all N95 masks are not sure for you to use now.

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On August 25, the FDA released an ad requesting that people "stop using some N95" respirators manufactured by Shanghai Dashag, a Chinese-based mask manufacturer. The Company had already obtained the approval of its respirators from the National Institute of CCR (NIOSH), but the Institute revoked all the approvals of respirators. According to the ad, "the company has not implemented, maintain and control a quality management system".

Therefore, Shanghai Dasheng lost an FDA permission for its N95 masks. "All Shanghai Dashang Shanghai-Dashang respirators previously authorized are no longer allowed for emergency use as a result of the loss of Niosh's approval," said the agency in the announcement.

Depending on the warning, affected respirators can be identified by cross-approval numbers that are no longer approved by NiOSH with the NIOSH approval label on any respirator manufactured by Shanghai Dashneng. There are nearly 40 relevant homologation numbers and numbers can usually beFound in red printed On or in the package, by Niosh.

"The FDA is alerting health care facilities risk managers, purchasing staff and health care staff on serious concerns with the quality of some N95 respirators made by Shanghai Dashag," said the agency.

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This is not the first time that Shanghai Dashag was involved in the controversy with his respirators in the United States in March 2020, poor quality boxes,Masks N95 counterfeit The Dasheng logo was shipped to front-line health workers in Los Angeles, California. But the company claimed that there were not these masks to the United States, because the counterfeit masks had earrings on them.

"The N95 masks exported by the company to the US market are all headband masks (with bands) that extend to the back of the head. We havenever exported N95 masks with earrings in the United States "Wu ShengrongPresident of Shanghai Dashag, President of Shanghai, told China Internet Information Center at the time.

RELATED:This type of mask will not protect you from the Delta variant, explains expert.