Known unknowns

BBC:

Meanwhile, as the US shortage of face masks becomes severe, the US Centers for Disease Control and Prevention (CDC) said nurses can “use homemade masks (e.g., bandana, scarf) for care of patients with Covid‑19”.

The CDC, one of the world’s leading public health institutes, said this should only be done “as a last resort” and conceded it was “unknown” if this would actually protect health workers from the virus.

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