中文
A study funded by Pfizer-BioNTech showed the efficacy of its Covid-19 vaccine – while still high – declined by 13 percentage points over six months after the second dose.
It is suggesting there could be a need for booster shots in the future.
“Efficacy peaked at 96.2 per cent during the interval from seven days to two months post-dose two, and declined gradually to 83.7 per cent from four months post-dose two to the data cut-off – an average decline of 6 per cent every two months,” the authors wrote in the paper.
“Ongoing follow-up is needed to understand persistence of the vaccine effect over time, the need for booster dosing, and timing of such a dose,” they said.
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