It is not possible to distinguish clearly between symptoms of the common cold, influenza and the COVID-19.
In an article in the Lancet, it was reported that there were three major patterns of the clinical course of infection:
It has been shown that children are less likely to contract the infection with more research needed to understand why. On the other hand, severe disease and fatalities are more likely in elderly or those with coexisting diseases, such as diabetes, pulmonary disease, and other chronic conditions.