CRP and pneumothorax: Circulating lymphocyte/monocyte/PBMC in the first 2 weeks were positively correlated to FVC and oxygenation index (OI), while negatively correlated to HRCT score, CRP, ferritin, LDH, and whether pneumomediastinum or pneumothorax occurred, demonstrating that lower Mono W0-2, Lymph W0-2, and PBMC W0-2 were as credible as previously reported biomarkers.