Whats the best type of mask for COVID-19 protection?
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Face masks have become part of everyday life since the onset of the pandemic, but they should be chosen with care to effectively limit the spread of COVID-19.
A research team in the US has investigated the filtration efficiency of various types of mask worn by the public and professionals. They found that when worn properly, certain nylon masks could be up to 79 percent effective at blocking particles that could carry the virus.
In partnership with the US Environmental Protection Agency, scientists from the North Carolina School of Medicine studied the levels of protection offered by several types of face mask, from medical masks to consumer-grade masks and improvised face coverings. They assessed the protection that each mask offers to its wearer when exposed to others who may be infected.
To achieve this, they used a method based on the Occupational Safety and Health Administration (Osha) Fit Test to determine the fitted filtration efficiency of the masks. In total, 12 types of facial protection were tested, worn by an adult male who made a series of repeated movements of the torso, head and facial muscles.
Published in the journal Jama Internal Medicine, the research reveals that improvised masks can prove effective, so long as they are properly fitted and worn.
Moreover, the researchers explain that unmodified medical procedure masks with ear loops -- commonly known as surgical masks -- offer 38.5 percent filtration efficiency. However, this can be improved to 60.3 percent when the ear loops are knotted in a specific way to tighten the fit, or to 80 percent by adding a layer of nylon.