The Oxford Vaccine Trial group have published interim results for phase 3 clinical trials of their COVID-19 vaccine candidate (ChAdOx1 vCoV-19). This vaccine utilises a viral vector platform and previous phase 1/2 studies have shown an acceptable safety profile. Participants in the phase 3 trials, held across the UK, Brazil and South Africa, were aged 18y or older. Findings have shown that when participants received 2 equal doses, vaccine efficacy was 62.1%. Participants who received a lower dose followed by a standard dose, vaccine efficacy was 90.0%.
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