Phase II/III Randomized Clinical Trial of Booster Dose of COVID-19 (Recombinant, Inactivated) Vaccine

The present protocol of Phase II/III studies.The Phase II study consists in a randomized (1:1) controlled double-blinded trial that aims to evaluate the safety and immunogenicity of NDV-HXP-S 10μg as a dose of booster in comparison to the vaccine against COVID-19 BNT162b2 30μg in a population of 400 adult subjects (50% with age ≥ 60 years), regardless of past of infection by COVID-19, with proof of two or more doses of COVID-19, of which the last dose administered at least 120 days ago. The Phase III study consists in a randomized (3:1) controlled double-blinded trial that aims to evaluate the safety, immunogenicity and consistency of three consecutive batches of NDV-HXP-S 10μg as a dose of booster in comparison to the vaccine against COVID-19 BNT162b2 30μg in a population of 4000 adult subjects (20% with age ≥ 60 years), with similar characteristics as the population of Phase II.