For most of us, the growing evidence that the efficacy of Covid vaccines is declining over time should be a cause of worry. For the companies that have spent billions of dollars developing them, it's a once-in-a-lifetime opportunity.
Recent studies on vaccine effectiveness have led to a run of orders for boosters in recent weeks. The US will start distributing extra shots from September 20 and expects to roll out about 100-million doses in the coming months...
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