The Delta variant has shifted the war on the viral pandemic, reopening the use and debate of face masks.
On July 30, the United States saw a single day infection increase of 103,366 cases – the highest daily increase since February 2021 and directly attributed to the highly transmissible Delta variant.
Recent information from the U.S. Centers for Disease Control and Prevention (CDC) indicates that, in rare situations, fully vaccinated people can get infected with the Delta variant, which may not be severe to the infected. However, because of the number of viral loads in infected people in the nasal pharynx and throat, they can be carriers and can infect others – particularly unvaccinated people.
It is clear from the recent findings that the coronavirus is airborne and that apart from vaccines, non-medical countermeasures like face masks are life savers.
On July 27, the CDC recommended the use of face masks in indoor public spaces where the Delta variant surge is high and breakthrough infections are emerging. The CDC has also recommended the use of face masks in U.S. schools as the new school year begins soon.
Face masks that have filtering ability, provide tight fit, and give good form or comfort will find applications as barrier materials to counter infections.
Ongoing research on cotton and blends-based face coverings in the Nonwovens & Advanced Materials Laboratory at Texas Tech University has found that 3-ply surgical face masks can filtrate 60% to 80% of fine particles ranging from 30 nm to 150 nm – normally the size range of coronavirus.
While N95 filters are the gold standard, their continuous use may not be possible due to comfort. In a recent discussion, an internal medicine expert from Toronto, Canada stated that N95 masks can be worn continuously for up to 60 minutes. In isolation wards where acute COVID-19 patients are treated, such N95 masks, medical gowns and other precautions are necessary.
Surgical masks and enhanced face covers can provide some barrier efficiency against the virus and are highly recommended in areas where there are high and substantial infections due to the Delta variant.
The public must be informed about different face masks and their filtration and protection capabilities in order to make an informed judgment. Face masks are life savers and will find their place until the whole world is vaccinated.