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BACKGROUND A disease caused by a novel coronavirus virus, named coronavirus disease 2019（COVID-19）, broke out in Wuhan, China in December 2019, and spread around the word. As of March 4, 2020, 93090 confirmed cases and 2984 deaths have been reported in more than 80 countries and territories. It has triggered global public health security. However, the features and prognosis of COVID-19 are incompletely understood.CASE SUMMARY We here report that the erythrocyte sedimentation rate（ESR） increased in a confirmed COVID patient. The high level of ESR sustained for a long time even after the patient recovered from COVID-19, while all results related to tumor, tuberculosis, rheumatic diseases, anemia, etc. cannot explain the abnormal elevation of ESR presented in this case.CONCLUSION Although the increased ESR cannot be explained by all existing evidence, it possibly links the abnormal pathologic change in some COVID-19 patients and negative prognosis, and provides the clue to dissect the mechanism of illness progressing in COVID-19 and its prognosis.