Inclusion Criteria:  Subjects with confirmed diagnosis of COVID-19 infection by:  RT-PCR And Chest Computed tomography and laboratoty investigations. Patients with chronic chest disease including (COPD, bronchial asthma, ILD, bronchiectasis).  Exclusion Criteria:  Those who are diagnosed with viral pneumonia caused by viruses other than COVID-19.  Those who are not confirmed to be COVID-19 with PCR or by radiological and laboratory investigations.