Relative Severity of Common Human Coronaviruses and Influenza
in Patients Hospitalized With Acute Respiratory Infection:
Results From 8-Year Hospital-Based Surveillance in Quebec, Canada
https://academic.oup.com/jid/advance-article/doi/10.1093/infdis/jiaa477/5882014

More than just a common cold: Endemic coronaviruses OC43, HKU1, NL63, and 229E
associated with severe acute respiratory infection and fatality cases among healthy adults
https://onlinelibrary.wiley.com/doi/full/10.1002/jmv.26362
Human coronaviruses in severe acute respiratory infection (SARI) cases in southwest India
https://onlinelibrary.wiley.com/doi/full/10.1002/jmv.24296