Moderna's Covid-19 mRNA vaccine is likely to offer protection of up to a couple of years, its chief executive said on Thursday, even though more data is still needed to make a definitive assessment.
The US biotech company, which stunned the world last year by coming up with a vaccine against the disease caused by the new coronavirus in just a few weeks, received approval for its shot from the European Commission on Wednesday.
Given that vaccines development and pharmacovigilance usually require years, the protection duration of Covid-19 shots is a lingering question for scientists and regulators...