To support the clinical manifestation “metabolic acidosis” in the COVID-19, in the fifth sentence of paragraph one, we cited an inappropriate reference 4 “Huang, C. et al. Clinical features of patients infected with 2019 novel coronavirus in Wuhan, China. Lancet. 395, 497-506, (2020)” which needs to be replaced with Diagnosis and Treatment Protocol for COVID-19 (Trial Version 5) published by National Health Commission of the People’s Republic of China.