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The surgeon general disagrees with this claim. He claims that the masks do protect the healthcare workers. You can see the claim in this tweet, where he also

• DrScump 7y ago
  the masks do protect the healthcare workers Because properly equipped healthcare workers are also wearing eye protection. SARS-CoV-2 will quite happily enter at the eyes; in fact, eyes are a bigger attack surface than nostrils. With respect to protection from SARS coronaviruses, wearing just a mask and no eye protection is like a hockey goalie wearing a helmet but no mask.
  • MagnumOpus 7y ago
    > like a hockey goalie wearing a helmet but no mask. An apt comparison -- a damage reduction by 66% using only a fabric mask is massively worse than a damage reduction by 95% using proper PPE and procedures. In fact, it leaves you 7 times more likely to get infected (get hurt by a puck). But if anyone tried to sell the NHL-watching public the line that "helmets don't help", they would be rightfully humiliated in public.
    • loopz 7y ago
      For a helmet to help, it needs to be fit for purpose, otherwise they're dangerous as people assume they provide safety. When found, copy-cat masks are destroyed at border control, as they also don't provide the benefits to contain contagion.