Beijing, 10 ( Beijing time ) A new study from Duke University in the United States shows that even homemade cotton masks can block the new crown virus to some extent , but handkerchiefs , neck covers and knitted masks have little defensive effect . Researchers at Duke University tested 14 different types of facial masks to reach this conclusion.
Studies have shown that N95 masks are the most effective way to stop the spread of respiratory droplets. Others that performwell in preventing leakage include three-layer surgical masks and cotton masks, which can be made at home.
But research shows that while handkerchiefs and knitted masks may look cool, they don’t provide much protection for wearers.
Scientists at Duke University also found that the neck sleeves that winter runners often wear are the least blocking, actually allowing more breathing droplets to escape, less effective than wearing no shelter at all.
“We want to emphasize that we do encourage people to wear masks, but we want them to be effective,” the researchers said. “