Study: Anti-virus face shields allow almost all minute droplets to leak

Researchers have bad news for people who wear face shields to prevent novel coronavirus infections: The equipment is woefully inadequate in containing droplets that can spread the virus.

According to the results released in August, the face shield allowed nearly 100 percent of aerosol particles, which measure 5 micrometers or less, and half of droplets of 50 micrometers to leak.

The researchers in Japan used a supercomputer to model the behavior of particles and droplets exhaled with a face shield. The results show why a mask is necessary and a face shield alone will not provide filtering.