The Journal of infectious diseases · 2022
Immunogenicity and Safety of a 3-Dose Regimen of a SARS-CoV-2 Inactivated Vaccine in Adults: A Randomized, Double-Blind, Placebo-Controlled Phase 2 Trial.
Клиническое исследование II фазыСтатьяРандомизированное исследованиеНазвание и аннотация: Перевод пока не подготовлен
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Liu Jiankai, Huang Baoying, Li Guifan, Chang Xianyun, Liu Yafei, Chu Kai, Hu Jialei, Deng Yao, Zhu Dandan, Wu Jingliang, Zhang Li, Wang Meng, Huang Weijin, Pan Hongxing, Tan Wenjie
Аннотация
BACKGROUND: Control of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) pandemic needs effective vaccines.
METHODS: In a phase 2 randomized, double-blind, placebo-controlled trial, 500 adults aged 18-59 years or ≥60 years were randomized in 2:2:1 ratio to receive 3 doses of 5 μg or 10 μg of a SARS-CoV-2 inactivated vaccine, or placebo separated by 28 days. Adverse events (AEs) were recorded through day 28 after each dosing. Live virus or pseudovirus neutralizing antibodies, and receptor binding domain immunoglobulin G (RBD-IgG) antibody were tested after the second and third doses.
RESULTS: Two doses of the vaccine elicited geometric mean titers (GMTs) of 102-119, 170-176, and 1449-1617 for the 3 antibodies in younger adults. Pseudovirus neutralizing and RBD-IgG GMTs were similar between older and younger adults. The third dose slightly (<1.5 fold) increased GMTs. Seroconversion percentages were 94% or more after 2 doses, which were generally similar after 3 doses. The predominant AEs were injection-site pain. All the AEs were grade 1 or 2 in intensity. No serious AE was deemed related to study vaccination.
CONCLUSIONS: Two doses of this vaccine induced robust immune response and had good safety profile. A third dose given 28 days after the second dose elicited limited boosting antibody response.
METHODS: In a phase 2 randomized, double-blind, placebo-controlled trial, 500 adults aged 18-59 years or ≥60 years were randomized in 2:2:1 ratio to receive 3 doses of 5 μg or 10 μg of a SARS-CoV-2 inactivated vaccine, or placebo separated by 28 days. Adverse events (AEs) were recorded through day 28 after each dosing. Live virus or pseudovirus neutralizing antibodies, and receptor binding domain immunoglobulin G (RBD-IgG) antibody were tested after the second and third doses.
RESULTS: Two doses of the vaccine elicited geometric mean titers (GMTs) of 102-119, 170-176, and 1449-1617 for the 3 antibodies in younger adults. Pseudovirus neutralizing and RBD-IgG GMTs were similar between older and younger adults. The third dose slightly (<1.5 fold) increased GMTs. Seroconversion percentages were 94% or more after 2 doses, which were generally similar after 3 doses. The predominant AEs were injection-site pain. All the AEs were grade 1 or 2 in intensity. No serious AE was deemed related to study vaccination.
CONCLUSIONS: Two doses of this vaccine induced robust immune response and had good safety profile. A third dose given 28 days after the second dose elicited limited boosting antibody response.