Immunity from double dose of Pfizer wanes after three months - study

The study backs up the need for booster doses to prevent people suffering breakthrough infections as immunity wanes. File Picture: Richard Walker/PA Wire

Experts who have been tracking the effectiveness of the Pfizer/BioNTech vaccine have found that the risk of Covid infection increases the longer it is since people had a second dose - and that immunity wanes after the first three months of being double vaccinated.

The study backs up the need for booster doses to prevent people suffering breakthrough infections as immunity wanes, according to the team, who published their findings in the British Medical Journal (BMJ).