1. Overview of EU/EEA country recommendations on COVID-19 vaccination with Vaxzevria, and a scoping review of evidence to guide decision-making. 18 May 2021,2021
2. Heterologous prime-boost COVID-19 vaccination: initial reactogenicity data;Shaw;Lancet,2021
3. Immunogenicity and reactogenicity of a heterologous COVID-19 prime-boost vaccination compared with homologous vaccine regimens;Schmidt;medRxiv,2021
4. Immunogenicity and reactogenicity of BNT162b2 booster in ChAdOx1S-primed participants (CombiVacS): a multicentre, open-label, randomised, controlled, phase 2 trial;Borobia;Lancet,2021
5. A global database of COVID-19 vaccinations;Mathieu;Nat Hum Behav,2021