Immunogenicity and Safety of a Newly Developed Tetanus-Diphtheria Toxoid (Td) in Healthy Korean Adolescents: a Multi-center, Randomized, Double-blind, Active-Controlled Phase 3 Trial

• Published in: Journal of Korean medical science Vol. 36; no. 49; p. e313
• Main Authors: Choi, Ui Yoon, Kim, Ki Hwan, Lee, Jin, Eun, Byung Wook, Kim, Hwang Min, Lee, Kyung-Yil, Kim, Dong Ho, Ma, Sang Hyuk, Lee, Jina, Kim, Jong-Hyun
• Format: Journal Article
• Language: English
• Published: Korea (South) The Korean Academy of Medical Sciences 20-12-2021; 대한의학회
• Subjects: Antibodies, Bacterial - blood; Antibody Formation; Child; Diphtheria - immunology; Diphtheria - prevention & control; Diphtheria-Tetanus Vaccine - administration & dosage; Diphtheria-Tetanus Vaccine - adverse effects; Diphtheria-Tetanus Vaccine - immunology; Double-Blind Method; Enzyme-Linked Immunosorbent Assay; Erythema - etiology; Female; Humans; Male; Original; Pain - etiology; Pain - pathology; Republic of Korea; Tetanus - immunology; Tetanus - prevention & control; 의학일반; Republic of Korea; Tetanus Toxoid; Safety; Clinical Trial; Diphtheria Toxoid; Immunity
• ISSN: 1011-8934; 1598-6357
• DOI: 10.3346/jkms.2021.36.e313

Although the combination tetanus toxoid, reduced diphtheria toxoid, and acellular pertussis vaccine (Tdap) is recommended at adolescence in developed countries, the tetanus and diphtheria toxoid vaccine (Td), which is less costly, is recommended instead in some parts of the world. A new Td, BR-TD-1001, was developed by a Korean manufacturer for distribution to endemic regions and for use in the initial step of novel Tdap development.
This phase 3, randomized, double-blind, multi-center trial, conducted in Korea, aimed to evaluate the immunogenicity and safety of BR-TD-1001. Healthy children aged 10 to 12 years were randomized 1:1 to receive either BR-TD-1001 or the control Td (Td-pur, GlaxoSmithKline). Antibodies were measured using enzyme-linked immunosorbent assay.
A total of 218 subjects (BR-TD-1001, n = 108; control, n = 110) were enrolled and included in the safety analysis. Vaccine-mediated antibody responses were similar in both groups. We confirmed the non-inferiority of BR-TD-1001 against the control, Td; 100% of both groups achieved seroprotection against diphtheria and tetanus. Furthermore, there was no significant difference between groups in the proportion of participants who demonstrated boost responses against diphtheria and tetanus toxoids. The incidence of solicited local and systemic adverse events (AEs), unsolicited AEs, and serious AEs did not differ significantly between groups.
The BR-TD-1001 satisfied the immunological non-inferiority criterion against diphtheria and tetanus, with a clinically acceptable safety profile.
ClinicalTrials.gov Identifier: NCT04618939.