A survey reveals that making sure a mask fits tightly and using two masks may reduce a person’s exposure to Covid-19. This was studied by the US Centres of Disease Control and Prevention (CDC) in January to see the effectiveness of wearing a cloth mask over a three-ply medical procedure mas, and knotting the ear loops of a surgical mask, and then tucking the excess material close to the face to protect against Covid-19.
It shows that both methods helped reduce the exposure to potentially infected aerosols by more than 90 percent in laboratory simulations. It also revealed that wearing a mask helped reduce exposure to aerosol particles that were the size of droplets that spread Covid-19 when compared to wearing no mask at all.
“Masks work, and they work best when they have a good fit and are worn correctly,” CDC Director Rochelle Walensky said.
The double mask combination, according to CDC, blocked 92.5 percent of the cough particles.