New Coronavirus aerosol can reach 4 meters away, wear a disposable protective mask
Research teams from the National Institutes of Health and the University of Pennsylvania used "laser scattering" technology to track the spread of droplets in the mouth during normal speech. The results show that the droplets are scattered in the air, but covering the speaker's mouth with a slightly damp towel can effectively prevent most of the droplets from spreading. This also illustrates the importance of wearing a mask. At the same time, the study found that the droplets sprayed when talking were smaller than those sprayed when coughing or sneezing. Harvard molecular biologist Matthew Meselson explained that larger droplets and smaller aerosols will take different approaches. Larger droplets are deposited in the upper respiratory tract, which is then cleared through nasal secretions, or rises to "mucosal fibers", and then is expelled or swallowed. But smaller aerosol particles can penetrate deep into the lungs, "build nests" in the alveoli, and begin to infect lung cells.
Another study found that an aerosol containing SARS-CoV-2 was still infectious for 3 hours in a tissue culture test.
The above research conclusion reminds us to wash hands frequently, disinfect disinfection, wear masks, ventilate frequently, and gather less.
Remember, the fight against the epidemic has not yet succeeded, and the mind still needs to be tense.