Denis Y. Logunov et al. Safety and efficacy of an rAd26 and rAd5 vector-based heterologous prime-boost COVID-19 vaccine: an interim analysis of a randomised controlled phase 3 trial in Russia, February 2, 2021,
https://doi.org/10.1016/S0140-6736(21)00234-8.
3
AstraZeneca, AZD1222 US Phase III trial met primary
efficacy endpoint in preventing COVID-19 at interim analysis,
March 22, 2021,
https://www.astrazeneca.com/media-centre/press-releases/2021/astrazeneca-us-vaccine-trial-met-primary-endpoint.html.