Moderna CEO: Company expects to know in November whether COVID-19 vaccine works
Moderna CEO Stephane Bancel says the Cambridge biotech will probably know in November whether its COVID-19 vaccine is safe and effective and could deliver 100 million doses to the US government in the “first few months of 2021.”

The company, which is enrolling 30,000 participants in a late-stage clinical trial, had hoped it might have interim results in October, Bancel said. But a slight decline in the average number of coronavirus cases in the country recently has made it harder to reach the minimum number of infections among participants to assess whether the vaccine works better than a placebo.

“The infection rate has slowed down the last two weeks, which is great for the country, but the readout in October becomes less and less probable,” he said. "We’ve said November,'' he added, and if the infection rate slows down further, “it could be December.”

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