Two doses of the Oxford/AstraZeneca Covid-19 vaccine are around 85 to 90 percent effective against the symptomatic disease, Public Health England (PHE) said on Thursday, citing an analysis of real-world data from the rollout of the shot.

Britain has suffered one of the worst death tolls globally from the pandemic but also had one of the fastest vaccine rollouts, generating a lot of data about the use of the shots in real-world settings.

In a weekly surveillance report, PHE said...