Vaccine efficacy (Number of symptomatic COVID-19 subjects with no evidence of previous exposure to viral infection): Those subjects with SARS-CoV-2 positive RT-PCR who present at least one major symptom or sign will pay tribute to the efficacy evaluation or at least two of the minor symptoms or signs of COVID-19. Measurement time: from 14 days after the 3rd dose of the research product.

Vaccine efficacy (Number of symptomatic COVID-19 subjects with no evidence of previous exposure to viral infection): Those subjects with SARS-CoV-2 positive RT-PCR who present at least one major symptom or sign will pay tribute to the efficacy evaluation or at least two of the minor symptoms or signs of COVID-19. Measurement time: from 14 days after the 3rd dose of the research product.