Proper Double-Masking Increases COVID Protection: CDC
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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 percent.

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.

Each modification substantially improved source control and reduced wearer exposure, according to a report released by the CDC on Feb.10. "Based on experiments that measured the filtration efficiencies of various cloth masks and a medical procedure mask, it was estimated that the better fit achieved by combining these two mask types, specifically a cloth mask over a medical procedure mask, could reduce a wearer's exposure by over 90 percent," said the report.

These laboratory-based experiments highlight the importance of a good fit to optimize mask performance. Until vaccine-induced population immunity is achieved, universal masking is a highly effective means to slow the spread of SARS-CoV-2 when combined with other protective measures, such as physical distancing, avoiding crowds, and poorly ventilated indoor spaces, and good hand hygiene, according to the CDC.

Source:
https://www.cdc.gov/mmwr/volumes/70/wr/mm7007e1.htm?s_cid=mm7007e1_w
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