“…The World Health Organization reports that the complication of pneumonia in a lower percentage of patients with COVID-19 is moderate compared to patients infected with other respiratory pathogens [ 47 ]. Accordingly, there is a need to determine whether the clinical case burden of hospitalised patients with pneumonia and proven infection caused by endemic coronaviruses is similar to that of those infected with SARS-CoV-2 [ 48 ]. We observed a longer duration of hospital treatment in patients co-infected with HCoV compared with those mono-infected with SARS-CoV-2.…”