1. A single dose of ChAdOx1 Chik vaccine induces neutralizing antibodies against four chikungunya virus lineages in a phase 1 clinical trial.
- Author
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Folegatti PM, Harrison K, Preciado-Llanes L, Lopez FR, Bittaye M, Kim YC, Flaxman A, Bellamy D, Makinson R, Sheridan J, Azar SR, Campos RK, Tilley M, Tran N, Jenkin D, Poulton I, Lawrie A, Roberts R, Berrie E, Rossi SL, Hill A, Ewer KJ, and Reyes-Sandoval A
- Subjects
- Adolescent, Adult, Chikungunya Fever prevention & control, Chikungunya Fever virology, Chikungunya virus classification, Chikungunya virus physiology, Cytokines immunology, Cytokines metabolism, Enzyme-Linked Immunosorbent Assay, Fatigue chemically induced, Female, Headache chemically induced, Humans, Immunoglobulin G immunology, Injections, Intramuscular, Male, Middle Aged, T-Lymphocytes immunology, T-Lymphocytes metabolism, Vaccination methods, Viral Vaccines administration & dosage, Viral Vaccines adverse effects, Young Adult, Antibodies, Neutralizing immunology, Antibodies, Viral immunology, Chikungunya Fever immunology, Chikungunya virus immunology, Viral Vaccines immunology
- Abstract
Chikungunya virus (CHIKV) is a reemerging mosquito-borne virus that causes swift outbreaks. Major concerns are the persistent and disabling polyarthralgia in infected individuals. Here we present the results from a first-in-human trial of the candidate simian adenovirus vectored vaccine ChAdOx1 Chik, expressing the CHIKV full-length structural polyprotein (Capsid, E3, E2, 6k and E1). 24 adult healthy volunteers aged 18-50 years, were recruited in a dose escalation, open-label, nonrandomized and uncontrolled phase 1 trial (registry NCT03590392). Participants received a single intramuscular injection of ChAdOx1 Chik at one of the three preestablished dosages and were followed-up for 6 months. The primary objective was to assess safety and tolerability of ChAdOx1 Chik. The secondary objective was to assess the humoral and cellular immunogenicity. ChAdOx1 Chik was safe at all doses tested with no serious adverse reactions reported. The vast majority of solicited adverse events were mild or moderate, and self-limiting in nature. A single dose induced IgG and T-cell responses against the CHIKV structural antigens. Broadly neutralizing antibodies against the four CHIKV lineages were found in all participants and as early as 2 weeks after vaccination. In summary, ChAdOx1 Chik showed excellent safety, tolerability and 100% PRNT
50 seroconversion after a single dose., (© 2021. The Author(s).)- Published
- 2021
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