The safety and immunogenicity of an inactivated SARS-CoV-2 vaccine in Chinese adults aged 18-59 years: A phase I randomized, double-blinded, controlled trial.
Vaccine
; 39(20): 2746-2754, 2021 05 12.
Article
in English
| MEDLINE | ID: covidwho-1174522
ABSTRACT
BACKGROUND:
This study examined the safety and immunogenicity of an inactivated SARS-CoV-2 vaccine.METHOD:
In a phase I randomized, double-blinded, placebo-controlled trial involving 192 healthy adults 18-59 years old, two injections of three doses (50 EU, 100 EU, 150 EU) of an inactivated SARS-CoV-2 vaccine or placebo were administered intramuscularly at a 2- or 4-week interval. The safety and immunogenicity of the vaccine were evaluated.RESULTS:
Vaccination was completed in 191 subjects. Forty-four adverse reactions occurred within 28 days, most commonly mild pain and redness at the injection site or slight fatigue. At days 14 and 28, the seroconversion rates were 87.5% and 79.2% (50 EU), 100% and 95.8% (100 EU), and 95.8% and 87.5% (150 EU), respectively, with geometric mean titers (GMTs) of 18.1 and 10.6, 54.5 and 15.4, and 37.1 and 18.5, respectively, for the schedules with 2-week and 4-week intervals. Seroconversion was associated with synchronous upregulation of antibodies against the S protein, N protein and virion and a cytotoxic T lymphocyte (CTL) response. No cytokines and immune cells related to immunopathology were observed. Transcriptome analysis revealed the genetic diversity of immune responses induced by the vaccine.INTERPRETATION:
In a population aged 18-59 years in this trial, this inactivated SARS-CoV-2 vaccine was safe and immunogenic. TRIAL REGISTRATION CTR20200943 and NCT04412538.Keywords
Full text:
Available
Collection:
International databases
Database:
MEDLINE
Main subject:
Vaccines
/
COVID-19 Vaccines
/
COVID-19
Type of study:
Experimental Studies
/
Randomized controlled trials
Topics:
Vaccines
Limits:
Adolescent
/
Adult
/
Humans
/
Middle aged
/
Young adult
Country/Region as subject:
Asia
Language:
English
Journal:
Vaccine
Year:
2021
Document Type:
Article
Affiliation country:
J.vaccine.2021.04.006
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