2021 Volume 57 Issue 11 Pages 427-431
In this paper, the possibility of COVID-19 infection routes analyzed from the viewpoint of fine particle
technology was introduced. Large saliva droplets containing a large amount of virus fall in a short time, and the
contaminated surfaces may cause the source of fomite transmission. However, infection does not occur just by
attaching the virus on our hands. Therefore, hand washing helps prevent infection. In contrast, the amount of
viral load in small droplets that cause aerosol infection is only 0.01-0.001 wt％ of the total viral load in saliva.
Therefore, wearing a mask is very effective in preventing infection. However, depending on contact time and
number of people, accumulation of aerosols in space can cause aerosol infection. Therefore, it is important to
properly ventilate the space. In addition, since highly infectious mutant COVID-19 strains may enhance aerosol
infection, medical knowledge is desired.
