Safety and Tolerability Study of the VAC∆6 Vaccine in Volunteers Aged 18-40 Years

Summary

The aim of the clinical study is to study the safety and tolerability of the live cell-based vaccine against smallpox and other orthopoxvirus infections (VAC∆6 vaccine) based on vaccinia virus, in intracutaneous administration. The research tasks are to: * evaluate the safety of various schemes for the use of the VAC∆6 vaccine using a set of clinical and laboratory-instrumental methods (thermometry, blood pressure registration, auscultation of the heart and lungs, electrocardiography (ECG), complete blood count and common urine test, biochemical, immunological, and virological studies); * evaluate the reactogenicity of various schemes for the use of the VAC∆6 vaccine (taking into account the number of local and systemic reactions, the percentage of those vaccinated with various degrees of manifestation of systemic and local reactions); * evaluate the possibility of virus shedding into the environment by volunteers; * evaluate the immunological efficacy of various vaccine administration schemes; * identify the development of undesirable reactions to the administration of the vaccine; * evaluate the cellular immune response to the introduction of various schemes for the use of the vaccine; * evaluate preliminary efficacy data in order to select an optimal scheme for the administration of the vaccine to make a decision on conducting Phase II clinical trials in an extended group of volunteers.

Timeline

Start

2019-05-18

Primary completion

2019-07-22

Completion

2020-01-27

Publications

• Background Yakubitskiy SN, Kolosova IV, Maksyutov RA, Shchelkunov SN. Attenuation of Vaccinia Virus. Acta Naturae. 2015 Oct-Dec;7(4):113-21.
• Background Yakubitskyi SN, Kolosova IV, Maksyutov RA, Shchelkunov SN. Highly immunogenic variant of attenuated vaccinia virus. Dokl Biochem Biophys. 2016;466:35-8. doi: 10.1134/S1607672916010105. Epub 2016 Mar 31.
• Background Maksyutov RA, Yakubitskyi SN, Kolosova IV, Shchelkunov SN. Comparing New-Generation Candidate Vaccines against Human Orthopoxvirus Infections. Acta Naturae. 2017 Apr-Jun;9(2):88-93.
• Background Olson VA, Shchelkunov SN. Are We Prepared in Case of a Possible Smallpox-Like Disease Emergence? Viruses. 2017 Aug 27;9(9):242. doi: 10.3390/v9090242.
• Background Shchelkunova GA, Shchelkunov SN. 40 Years without Smallpox. Acta Naturae. 2017 Oct-Dec;9(4):4-12.
• Background Shchelkunov SN, Shchelkunova GA. [We should be prepared to smallpox re-emergence.]. Vopr Virusol. 2019;64(5):206-214. doi: 10.36233/0507-4088-2019-64-5-206-214. Russian.
• Background Maksyutov RA, Yakubitskiy SN, Kolosova IV, Tregubchak TV, Shvalov AN, Gavrilova EV, Shchelkunov SN. Genome stability of the vaccine strain VACDelta6. Vavilovskii Zhurnal Genet Selektsii. 2022 Jul;26(4):394-401. doi: 10.18699/VJGB-22-48.
• Background Shchelkunov SN, Shchelkunova GA. Genes that Control Vaccinia Virus Immunogenicity. Acta Naturae. 2020 Jan-Mar;12(1):33-41. doi: 10.32607/actanaturae.10935.
• Background Marennikova SS, Shchelkunov SN. Orthopoxviruses pathogenic for humans (monograph). KMK Scientific Press Ltd.1998; 386 p. (in Russian).
• Background Kolosova IV, Babkina IN, Yakubitsky SN, Maksyutov RA, Safronov PF, Shchelkunov SN. Recombinant strain L-IVP 1421ABJCN of vaccinia virus with deleted virulence genes A56R, B8R, J2R, C3L, N1L to obtain a live cell-based attenuated vaccine against smallpox and other orthopoxviruses pathogenic to humans. RF Patent No. 2588388, priority 20.04.2015 (in Russian)
• Background Yakubitsky SN, Kolosova IV, Maksyutov RA, Shchelkunov SN. Recombinant strain VACΔ6 of vaccinia virus with deleted virulence genes C3L, N1L, J2R, A35R, A56R, B8R for obtaining a live cell-based attenuated vaccine against smallpox and other human orthopoxvirus infections. RF Patent No. 2621868, priority 24.06.2016 (in Russian).

Drugs

Indications