Epidemiological characteristics and serum antibody detection of a COVID-19 aggregated outbreak in vaccinated population.
10.3760/cma.j.cn112150-20220627-00659
- VernacularTitle:新型冠状病毒疫苗接种人群中一起新型冠状病毒感染聚集性疫情流行病学特征及血清抗体检测分析
- Author:
Zhen Yong REN
1
;
Hai Ying GONG
2
;
Dan XIN
3
;
Li ZHANG
1
;
Shuang LI
1
;
Xin ZHANG
1
;
Meng CHEN
4
;
Xing Huo PANG
1
Author Information
1. Beijing Center for Disease Control and Prevention, Institute of Infectious and Endemic Disease Control, Beijing 100013, China.
2. Department of Planned Immunization, Fangshan District Center for Disease Control and Prevention, Beijing 102401, China.
3. Department of Infectious Diseases and Endemic Diseases, Fangshan District Center for Disease Control and Prevention, Beijing 102401, China.
4. Beijing Center for Disease Control and Prevention, Institute of Immunization, Beijing 100013, China.
- Publication Type:Journal Article
- MeSH:
Humans;
COVID-19;
SARS-CoV-2;
Disease Outbreaks;
COVID-19 Vaccines;
Immunoglobulin G;
Antibodies, Viral
- From:
Chinese Journal of Preventive Medicine
2023;57(5):728-731
- CountryChina
- Language:Chinese
-
Abstract:
An epidemiological investigation was conducted on a cluster epidemic of COVID-19 in the vaccinated population in Beijing in 2022, and serum samples were collected from 21 infected cases and 61 close contacts (including 20 cases with positive nucleic acid in the isolation observation period). The results of antibody detection showed that the IgM antibody of two infected persons was positive, and the IgG antibody positive rates of patients who were converted, not converted to positive and infected persons were 36.84% (7/19), 63.41% (26/41) and 71.43% (15/21), respectively. About 98.78% of patients had been vaccinated with the SARS-CoV-2 inactivated vaccine. The positive rate of IgG antibody in patients immunized with three doses of vaccine was 86.00% (43/50), which was higher than that in patients with one or two doses [16.12% (5/31)]. The antibody level of M (Q1, Q3) in patients immunized with three doses was 4.255 (2.303, 7.0375), which was higher than that in patients with one or two doses [0.500 (0.500, 0.500)] (all P values<0.001). The antibody level of patients who were vaccinated less than three months [7.335 (1.909, 7.858)] was higher than that of patients vaccinated more than three months after the last vaccination [2.125 (0.500, 4.418)] (P=0.007). The positive rate and level of IgG antibody in patients who were converted to positive after three doses were 77.78% (7/9) and 4.207 (2.216, 7.099), respectively, which were higher than those in patients who were converted after one or two doses [0 and 0.500 (0.500, 0.500)] (all P values<0.05).
