Recently, news about severe pneumonia caused by colds has attracted more people's attention and vigilance. 70% to 80% of colds are caused by viruses such as rhinovirus, coronavirus, influenza virus.
If a cold is not treated promptly and effectively, it may turn into pneumonia. Underlying diseases or low immunity may cause mild or even no symptoms in a normal adult, but for people with low immunity, it could be a "trigger" If symptoms do not improve after treatment, you need to seek medical treatment in time.