Why do we focus on common cold and bacterial pneumonia

Common cold and influenza are often complicated by pneumococcal pneumonia, but the complication whereas pneumococcal pneumonia complicating COVID-19 is not common. Both influenza and COVID-19 are respiratory viral infections, and their pathogenesis depends on the host immune response. Therefore, clinically, accurate pathogen diagnosis in the early stage of the clinical course for the purpose of formulating an appropriate treatment plan may contribute to improvement of the patient prognosis. Clinical characteristics of COVID-19 in clinical manifestations, epidemiological history, laboratory findings and radiological findings, some of which were different and some of which were similar from influenza or any other common cold. We would like to emphasize the importance of researching the mechanism of pneumonia induced from common cold, influenza, COVID-19 and any other respiratory viral infection.