NCT04864561

COV-COMPARE Immunogenicity of Vaccine VLA2001 Compared to AZD1222

A Randomized, Observer-Blind, Controlled, Superiority Study To Compare The Immunogenicity Against COVID-19, Of VLA2001 Vaccine To AZD1222 Vaccine, In Adults Including a Randomized, Observer-blind, Placebo Controlled Part in Adolescents (≥12 to <18 Years)

• Status: Completed
• Phase: Phase 3
• Study type: Interventional
• Enrollment: 4,034 (actual)
• Sponsor: Valneva Austria GmbH · Industry
• Sex: All
• Age: 12 Years
• Healthy volunteers: Accepted

Summary

This is a multicentre, randomized, observer-blind, active-controlled, superiority, study in adults to compare the immunogenicity of VLA2001 to AZD1222 in terms of GMT of SARS-CoV-2-specific neutralising antibodies. Furthermore, VLA2001 will be compared to placebo in an adolescent population.

Detailed description

Approximately 4000 Adult participants will be recruited in the study. About 3000 participants aged 30 years and above will be randomized in a 2:1 ratio to receive 2 intramuscular recommended doses of either VLA2001 (n=2000) or AZD1222 (n=1000). In addition, approximately 1000 subjects aged 18-29 years will participate in this study in a non-randomized, open-label fashion to receive VLA2001. The 2 doses of vaccination for both vaccines will be administered 28 days apart, on Days 1 and 29. All visits will be conducted at the clinical site on an outpatient basis. All participants - except those who already received a licensed COVID-19 vaccine outside of the study - will be offered a booster dose with VLA2001 between Jan and Mar 2022 and will have a follow-up visit 14 days (Visit B2) and 6months after the booster dose. Approximately 660 Adolescent participants were planned to be recruited and randomized in a 1:1 ratio to receive 2 intramuscular doses of either VLA2001 (n=330) or placebo (n=300). Participants in the placebo group will receive a 2-dose primary immunization with VLA2001 on Day 85 and the second vaccination 28 days later. For safety reasons, the first 16 adolescents will be enrolled in an open label, non-randomized manner (sentinel dosing). Recruitment of adolescent participants has been stopped after recruitment of 6 randomized participants (3 randomized to VLA2001 and 3 participants randomized to placebo) due to the low recruitment rate. The study design ensures a safety follow-up of at least 6 months after the last VLA2001 vaccination/booster for all enrolled study participants Participants will be provided with an electronic Diary (e-Diary) and will be trained to record specifically solicited systemic and local symptoms daily as well as any additional AEs during follow-up period after each of both vaccinations up to the next visit to the site until Day 43 visit has been completed.

Conditions

• SARS-CoV-2 Virus Infection

Interventions

Type	Name	Description
BIOLOGICAL	VLA2001	whole virus inactivated SARS-CoV-2 vaccine adjuvanted with cytosine phospho-guanine (CpG) 1018 in combination with aluminium hydroxide 2 vaccinations 28 days apart
BIOLOGICAL	AZD1222	2 vaccinations 28 days apart AZD1222 is a recombinant, replication-defective chimpanzee adenovirus expressing the SARS-CoV-2 S surface glycoprotein.
BIOLOGICAL	VLA2001 - adolescent part	whole virus inactivated SARS-CoV-2 vaccine adjuvanted with cytosine phospho-guanine (CpG) 1018 in combination with aluminium hydroxid 2 vaccinations 28 days apart and with a booster vaccination on day 208. Placebo group will receive VLA2001 on day 208 and following second vaccination 28 days later.
BIOLOGICAL	Placebo	2 vaccinations 28 days apart with placebo (PBS buffer based on Dulbecco's PBS media formulation without Calcium and Magnesium )

Timeline

• Start date: 2021-04-26
• Primary completion: 2021-07-19
• Completion: 2023-03-13
• First posted: 2021-04-29
• Last updated: 2023-03-20

Locations

31 sites across 1 country: United Kingdom