Washington, Feb 11 (TIWN) The US Centers for Disease Control and Prevention (CDC) has recently conducted experiments to improve the fit of masks amid Covid-19 pandemic, suggesting that combining cloth mask and medical procedure mask could reduce a wearer's exposure to virus by over 90 per cent.

In January, the CDC conducted experiments to assess two ways of improving the fit of medical procedure masks: fitting a cloth mask over a medical procedure mask, and knotting the ear loops of a medical procedure mask and then tucking in and flattening the extra material close to the face, the Xinhua news agency reported.