Vaccination Shortens the Negative Nucleic Acid Conversion Time of the Older Population: A Retrospective Cohort Study of 73,456 Asymptomatic and Mild Patients with COVID-19 in Shanghai

Abstract

Chaoqun Wang,1,* Meng Yang,2,* Guanglin Zhu,3,* Yanyan Hu,1,* Le Shen,1 Jiaona Qiu,1 Yi Huang,2 Libing Wang4 1Department of Endocrinology, the First Affiliated Hospital of Naval Medical University, Shanghai, 200433, People’s Republic of China; 2Department of Respiratory and Critical Care Medicine, the First Affiliated Hospital of Naval Medical University, Shanghai, 200433, People’s Republic of China; 3Department of Respiratory and Critical Care Medicine, Yangpu Hospital, School of Medicine, Tongji University, Shanghai, 200090, People’s Republic of China; 4Department of Hematology, the First Affiliated Hospital of Naval Medical University, Shanghai, 200433, People’s Republic of China*These authors contributed equally to this workCorrespondence: Libing Wang; Yi Huang, Email [email protected]; [email protected]: To explore the influencing factors to predict the negative nucleic acid conversion time and ORF1ab gene CT value changes in patients with asymptomatic and mild COVID-19.Patients and Methods: A total of 73,456 patients with asymptomatic and mild COVID-19 admitted to the Mobile Cabin Hospital in Shanghai from April 3 to April 23, 2022 were selected as the research objects. Epidemiological, clinical, and laboratory data were collected. Correlation analysis was performed.Results: In patients 65 years of age, patients with comorbidity and patients with symptoms, compared with patients 18– 65 years of age, patients without comorbidity and patients without symptoms, there was a greater difference in the rate of rise of CT values between vaccinated and unvaccinated patients (P< 0.05).Conclusion: The time of nucleic acid conversion to negative in patients with asymptomatic and mild COVID-19 is affected by age, comorbidity, and first nucleic acid CT value. Vaccination could shorten the negative nucleic acid conversion time of the older population, those with complications or symptoms. The vaccination of older patients does not increase the risk of symptoms.Keywords: COVID-19, nucleic acid detection, CT value, vaccine, older population

Keywords

• covid-19
• nucleic acid detection
• ct value
• vaccine
• older population;