COVID-19 is spherical or oval, which is highly contagious. Infection can be spread through droplets, aerosols, indirect contact, mother-to-child and other ways. After being infected with the virus, patients may have symptoms such as fever, dry cough and general fatigue. Some patients may also have changes in sense of smell and taste, and some patients will not feel uncomfortable after being infected with the virus. However, COVID-19 tested positive for nucleic acid, so they need to wear masks correctly when going out to avoid going to densely populated places.