1. Covid-19: Pfizer vaccine efficacy was 52% after first dose and 95% after second dose, paper shows
2. Covid-19: Pfizer BioNTech vaccine reduced cases by 94% in Israel, shows peer reviewed study
3. Covid-19: New data on Oxford AstraZeneca vaccine backs 12 week dosing interval
4. Emary T. Golubchik. Efficacy of ChAdOx1 nCoV-19 (AZD1222) Vaccine Against SARS-CoV-2 VOC 202012/01 (B.1.1.7). 4 Feb 2021. https://papers.ssrn.com/sol3/papers.cfm?abstract_id=3779160.
5. Rawlinson K, Sample I. Oxford Covid vaccine has 10% efficacy against South African variant, study suggests. Guardian. 8 Feb 2021. https://www.theguardian.com/world/2021/feb/08/oxford-covid-vaccine-10-effective-south-african-variant-study.