Frontiers in Immunology (Mar 2021)

Upregulated IL-6 Indicates a Poor COVID-19 Prognosis: A Call for Tocilizumab and Convalescent Plasma Treatment

  • Jian Wu,
  • Jiawei Shen,
  • Ying Han,
  • Qinghua Qiao,
  • Qinghua Qiao,
  • Wei Dai,
  • Bangshun He,
  • Bangshun He,
  • Rongrong Pang,
  • Rongrong Pang,
  • Jun Zhao,
  • Tao Luo,
  • Yanju Guo,
  • Yang Yang,
  • Qiuyue Wu,
  • Weijun Jiang,
  • Jing Zhang,
  • Mingchao Zhang,
  • Mingchao Zhang,
  • Na Li,
  • Na Li,
  • Weiwei Li,
  • Xinyi Xia,
  • Xinyi Xia

DOI
https://doi.org/10.3389/fimmu.2021.598799
Journal volume & issue
Vol. 12

Abstract

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A comprehensive understanding of the dynamic changes in interleukin-6 (IL-6) levels is essential for monitoring and treating patients infected with severe acute respiratory syndrome coronavirus 2 (SARS-Cov-2). By analyzing the correlations between IL-6 levels and health conditions, underlying diseases, several key laboratory detection indices, and the prognosis of 1,473 patients with the coronavirus disease 2019 (COVID-19), the role of IL-6 during SARS-CoV-2 infection was demonstrated. Our results indicated that IL-6 levels were closely related to age, sex, body temperature, oxygen saturation (SpO2) of blood, and underlying diseases. As a stable indicator, the changes in IL-6 levels could indicate the inflammatory conditions during a viral infection. Two specific treatments, namely, tocilizumab and convalescent plasma therapy (CPT), decreased the level of IL-6 and relieved inflammation. CPT has an important role in the therapy for patients with critical COVID-19. We also found that patients with IL-6 levels, which were 30-fold higher than the normal level, had a poor prognosis compared to patients with lower levels of IL-6.

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