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Epidemiol Infect ; 148: e164, 2020 07 27.
Article in English | MEDLINE | ID: covidwho-679966


The emergence of 2019 novel coronavirus disease (COVID-19) is currently a global concern. In this study, our goal was to explore the changing expression levels of acute-phase reaction proteins (APRPs) in the serum of COVID-19 patients and to elucidate the immunological characteristics of COVID-19. In the study design, we recruited 72 COVID-19 patients, including 22 cases of mild degree, 38 cases of moderate degree and 12 cases of severe degree. We also recruited 20 patients with community-acquired pneumonia (CAP) and 20 normal control subjects as a comparison. Fasting venous blood was taken to detect the content of complement 3 (C3), complement 4 (C4), C-reactive protein (CRP), serum amyloid A (SAA) and prealbumin (PA). When compared the COVID-19 group with the CAP and normal control groups, respectively, the mean value of CRP and SAA in the COVID-19 group (including mild, moderate and severe patients) had increased significantly (P < 0.01), whereas the mean values of C3, C4 and PA decreased (P < 0.01). For the asymptomatic or mild symptomatic patients with COVID-19, the actual aggravation of disease may be more advanced than the clinical appearances. Meanwhile, the statistical analyses indicated that the development of COVID-19 brought about a significant increase in the content of CRP and SAA (P < 0.01), and a decline in the content of C3, C4 and PA (P < 0.01). These findings suggested that the changes in the level of APRPs could be used as indicators to identify the degree and progression of COVID-19, and the significant changes might demonstrate the aggravation of disease. This study provided a new approach to improve the clinical management plan and prognosis of COVID-19.

Acute-Phase Proteins/analysis , Acute-Phase Proteins/biosynthesis , Coronavirus Infections/diagnosis , Coronavirus Infections/therapy , Pneumonia, Viral/diagnosis , Pneumonia, Viral/therapy , Adult , Aged , C-Reactive Protein/analysis , C-Reactive Protein/biosynthesis , COVID-19 , Case-Control Studies , Community-Acquired Infections/blood , Community-Acquired Infections/immunology , Complement C3/analysis , Complement C3/biosynthesis , Complement C4/analysis , Complement C4/biosynthesis , Coronavirus Infections/blood , Coronavirus Infections/immunology , Female , Humans , Male , Middle Aged , Pandemics , Pneumonia/blood , Pneumonia/immunology , Pneumonia, Viral/blood , Pneumonia, Viral/immunology , Prealbumin/analysis , Prealbumin/biosynthesis , Prognosis , Serum Amyloid A Protein/analysis , Serum Amyloid A Protein/biosynthesis , Severity of Illness Index , Young Adult