Will booster doses of a COVID-19 vaccine be needed?
Not enough time has passed since first vaccinations were given to be able to answer this question.
People enrolled in clinical trials are being followed up closely, which will allow this question to be answered in due course. For more information, please click here.
It is expected that small adjustments may be made to the vaccine if the COVID-19 virus changes so much that vaccine loses effectiveness. In this case booster doses will be required to better match the virus variants in circulation, like for the influenza vaccine. How frequently these changes will need to be made is unknown. A major advantage of mRNA vaccine technology is that these changes can be made very quickly (new batches available within a few months compared with more than 6 months for seasonal flu vaccines).