IL6 and pneumonia: According to the New Coronavirus Pneumonia Diagnosis and Treatment Program (7th edition) published by the National Health Commission of China, there were four severe/critical warning indexes, including peripheral blood lymphocytes progressively decreasing, peripheral blood inflammatory cytokines (such as IL-6 and C-reactive protein) gradually increasing, lactic acid processivity increasing, and pulmonary lesions rapidly evolving in a short period of time [12].