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Chinese Journal of Experimental and Clinical Infectious Diseases(Electronic Edition) ›› 2022, Vol. 16 ›› Issue (01): 16-24. doi: 10.3877/cma.j.issn.1674-1358.2022.01.003

• Research Article • Previous Articles     Next Articles

Influencing factors for negative conversion time of viral RNA from nasopharyngeal swabs of patients with coronavirus disease 2019

Fang Qian1, Meihua Song1, Di Tian1, Ziruo Ge1, Tingyu Zhang1, Aibin Wang1, Bing Han1, Yanli Xu1, Zhihai Chen1,()   

  1. 1. Department of Infectious Diseases, National Clinical Key Specialty for Infectious Diseases, Beijing Ditan Hospital, Capital Medical University, Beijing 100015, China
  • Received:2021-05-21 Online:2022-02-15 Published:2022-04-22
  • Contact: Zhihai Chen

Abstract:

Objective

To investigate the clinical and laboratory characteristics which influence the negative conversion time of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) ribonucleic acid (RNA) of nasopharyngeal swab in patients with coronavirus disease 2019 (COVID-19).

Methods

Total of 121 patients diagnosed as COVID-19 were admitted to Beijing Ditan Hospital, Capital Medical University, from June 11st 2020 to July 1st 2020. Clinical data of these patients were collected in this single-center retrospective case-control study. Cox proportional hazard regression model analysis was used to investigate the independent factors influencing negative conversion time of virus RNA in nasopharyngeal swabs of patients with COVID-19.

Results

The period from illness onset to the first day of the two consecutive negative results of nucleic acid of 121 patients with COVID-19 were [27 (23, 34)] days. Multivariate Cox regression analysis indicated that older than 45 years old (HR = 0.583, 95%CI: 0.388-0.877, P = 0.010) and body temperature > 39 ℃ (HR = 0.482, 95%CI: 0.254-0.914, P = 0.025) were all independent risk factors for negative conversion time of SARS-CoV-2 RNA, while CD8+ T cells > 300 cells/μl (HR = 1.708, 95%CI: 1.102-2.647, P = 0.017) was an independent protective factor affecting negative conversion time of SARS-CoV-2 RNA.

Conclusions

Predictors such as age > 45 years old, hyperthermia and CD8+ T lymphocyte count ≤ 300 cells/μl might help clinicians early identify the patients who may present with a longer positive duration of SARS-CoV-2 RNA, and adjust treatment strategies and isolation protocols.

Key words: Coronavirus disease 2019 (COVID-19), Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), Negative conversion time

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