Less effective is perhaps a misleading word choice, remember the Phase 3 trials are measuring efficacy in preventing any cases (as defined in the study endpoint

Less effective is perhaps a misleading word choice, remember the Phase 3 trials are measuring efficacy in preventing any cases (as defined in the study endpoint). Despite the efficacy being lower the Oxford vaccine is extremely effective, not a single vaccinated recipient was hospitalised once 21 days had passed from the first dose.