Limitations of our study include the retrospective nature of the study where all patients in the cohort presented to healthcare setting for evaluation. It is possible that there are infected individuals within the population with subclinical or mild clinical symptoms who did not present for care and the findings reported here are skewed toward those who were more symptomatic. Additionally, many of the more critically ill patients were transferred to other hospitals which were not included in this study. Our data were collected from six sites with variable CT scanning parameters though the data heterogeneity reflects the different practice parameters and settings. The patients did not have CT studies at regular intervals as often is the case in the clinical setting where the timing of imaging is dependent on the clinical course and different for each patient. Finally, even though the study describes evolution of CT findings, the chronic alterations in the pulmonary parenchyma remain to be determined. A longer follow-up would be needed.