SINGAPORE - While US drugmakers like Pfizer and Moderna made a killing from Covid-19 mRNA vaccine sales last year, sustaining similar volumes this year will be a challenge as more parts of the world become fully vaccinated.
At their 2021 results briefings last month, both drugmakers said they expect Covid-19 to enter the endemic phase this year, but regular booster shots will be needed to protect the public from new infections.
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