tetano
Editor, Senior Moderator
Vaccines (Basel)
. 2022 Jul 29;10(8):1215.
doi: 10.3390/vaccines10081215.
Protective Effect of Inactivated COVID-19 Vaccines against Progression of SARS-CoV-2 Omicron and Delta Variant Infections to Pneumonia in Beijing, China, in 2022
Juan Li[SUP] 1 [/SUP], Rui Song[SUP] 2 [/SUP], Zheng Yuan[SUP] 2 [/SUP], Zheng Xu[SUP] 3 [/SUP], Luodan Suo[SUP] 1 [/SUP], Qing Wang[SUP] 4 [/SUP], Yuan Li[SUP] 1 [/SUP], Yanlin Gao[SUP] 1 [/SUP], Xiaomei Li[SUP] 1 [/SUP], Xiaoyou Chen[SUP] 2 [/SUP], Jiang Wu[SUP] 1 [/SUP]
Affiliations
Abstract
This real-world study explores the effect of coronavirus disease 2019 (COVID-19) inactivated vaccines on the prevention of asymptomatic or mild Delta or Omicron variant infections progressing to pneumonia. Association between severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) pneumonia cases and vaccination was measured with a multivariable logistic regression, stratified by genotype and age groups. We recruited 265 cases (111 (41.9%) infected with Delta and 154 (58.1%) with Omicron variants). There were 22 asymptomatic infected individuals, 156 mild cases without pneumonia, and 87 moderate cases with pneumonia. There was a markedly increased risk of progression to pneumonia in Delta infected cases, unvaccinated, or partially vaccinated COVID-19 patients with diabetes and those aged ≥60 years. Patients who had completed booster doses of inactivated vaccines had a reduced risk of 81.6% (95% CI: 55.6-92.4%) in progressing to pneumonia over those who were unvaccinated or partially vaccinated. The risk of progressing to pneumonia was less reduced by 88.7% (95% CI: 56.6-97%) and 73.9% (95% CI: 1.4-93.1%) among Delta and Omicron-infected patients, and was reduced by 78.5% (95% CI: 45.3-91.6%) and 94.1% (95% CI: 21.5-99.6%) among patients aged <60 and ≥60 years, respectively. Our data indicated that a complete vaccination with a booster reduced the risk of asymptomatic or mild Delta or Omicron variant COVID-19 progressing to pneumonia and, thus, reduced the pressure of severe illness on medical resources.
Keywords: COVID-19; Delta; Omicron; effect; inactive vaccine; pneumonia.
. 2022 Jul 29;10(8):1215.
doi: 10.3390/vaccines10081215.
Protective Effect of Inactivated COVID-19 Vaccines against Progression of SARS-CoV-2 Omicron and Delta Variant Infections to Pneumonia in Beijing, China, in 2022
Juan Li[SUP] 1 [/SUP], Rui Song[SUP] 2 [/SUP], Zheng Yuan[SUP] 2 [/SUP], Zheng Xu[SUP] 3 [/SUP], Luodan Suo[SUP] 1 [/SUP], Qing Wang[SUP] 4 [/SUP], Yuan Li[SUP] 1 [/SUP], Yanlin Gao[SUP] 1 [/SUP], Xiaomei Li[SUP] 1 [/SUP], Xiaoyou Chen[SUP] 2 [/SUP], Jiang Wu[SUP] 1 [/SUP]
Affiliations
- PMID: 36016103
- DOI: 10.3390/vaccines10081215
Abstract
This real-world study explores the effect of coronavirus disease 2019 (COVID-19) inactivated vaccines on the prevention of asymptomatic or mild Delta or Omicron variant infections progressing to pneumonia. Association between severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) pneumonia cases and vaccination was measured with a multivariable logistic regression, stratified by genotype and age groups. We recruited 265 cases (111 (41.9%) infected with Delta and 154 (58.1%) with Omicron variants). There were 22 asymptomatic infected individuals, 156 mild cases without pneumonia, and 87 moderate cases with pneumonia. There was a markedly increased risk of progression to pneumonia in Delta infected cases, unvaccinated, or partially vaccinated COVID-19 patients with diabetes and those aged ≥60 years. Patients who had completed booster doses of inactivated vaccines had a reduced risk of 81.6% (95% CI: 55.6-92.4%) in progressing to pneumonia over those who were unvaccinated or partially vaccinated. The risk of progressing to pneumonia was less reduced by 88.7% (95% CI: 56.6-97%) and 73.9% (95% CI: 1.4-93.1%) among Delta and Omicron-infected patients, and was reduced by 78.5% (95% CI: 45.3-91.6%) and 94.1% (95% CI: 21.5-99.6%) among patients aged <60 and ≥60 years, respectively. Our data indicated that a complete vaccination with a booster reduced the risk of asymptomatic or mild Delta or Omicron variant COVID-19 progressing to pneumonia and, thus, reduced the pressure of severe illness on medical resources.
Keywords: COVID-19; Delta; Omicron; effect; inactive vaccine; pneumonia.