Researchers also said the vaccine protects people against the Wuhan and Kent strains of coronavirus.
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It means the Pfizer and AstraZeneca jabs may not need to be modified to protect against the strain.
Research in Cambridge also found a single dose cuts the number of asymptomatic infections.
New research gives a boost to the UK government's decision to delay the second dose of the Pfizer/BioNTech jab, but experts still urge caution.
Here’s a look at how the global vaccination programme is progressing – and why it matters just as much how other countries are faring as your own.
A bust-up between the European Union and the pharma giant has led to supply worries.
The BMA has warned there is no guarantee of the UK having enough Pfizer/BioNTech jabs in 12 weeks to deliver second doses.
One in eight adults aged 16-29 reported vaccine hesitancy in the latest data period, ONS has revealed.
The study, though not peer reviewed, is encouraging news in the fight against coronavirus.