Is neutrophilia associated with mortality in COVID‐19 patients? A meta‐analysis and meta‐regression

Dear Editors, Coronavirus disease 2019 (COVID-19) is spreading rapidly around the world. There are many published studies exploring the risk factors of severe and mortal COVID-19 patients. Huang et al reported that the elevated leukocyte counts and decreased lymphocyte counts were significantly associated with the severity of COVID-19. Although neutrophil counts were not uniformly reported in that study, they thought that neutrophilia was more specific to severe patients than leukocytosis. 1 3]