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Bandannas, gaiters and knitted masks are some of the least effective face coverings for preventing the spread of coronavirus, according to a new study.

Researchers at Duke University made the discovery while testing 14 different types of masks, according to .

N95 masks, often used by health care professionals, worked best to stop the transmission of respiratory droplets during regular speech. Other good performers at stopping leakage were three-layer surgical masks and cotton masks, which can be made at home, the researchers with Duke’s physics department found.