Astrazeneca Covid vaccine US Phase III trial met primary efficacy endpoint in preventing COVID-19 at interim analysis. No increased risk of thrombosis or events characterised by thrombosis among the 21,583 participants.
79% vaccine efficacy at preventing symptomatic COVID-19 100% efficacy against severe or critical disease and hospitalisation Comparable efficacy result across ethnicity and age,with 80% efficacy in participants aged 65 years and over Favourable reactogenicity and overall safety profile The AstraZeneca US Phase III trial of AZD1222 demonstrated statistically significant vaccine efficacy of 79% at preventing