The current tests for coronavirus infection and post-recovery immunity are both imperfect, a top scientific advisory panel told the White House this week.
From CNN's Jen Christensen
The effectiveness of homemade masks is"not possible to assess" at this time, said the National Academies of Sciences, Engineering and Medicine in a letter to the White House on Wednesday. How well masks work depend on how they are made, the quality of production, and on how well the person follows other precautionary behaviors, said the letter.Researchers believe Covid-19 primarily spreads via large droplets, such as when someone coughs or sneezes. But it is also believed to spread via invisible droplets, as small as 5 microns – and even smaller bioaerosol particles – that can be expelled when an infected person breathes.
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