The company said 85 million to 100 million of those doses would be available in the United States, with 15 million to 25 million available outside the country.
The first-quarter doses are within the 500 million to up to 1 billion doses the company expects to manufacture globally in 2021, Moderna said.
Results from an early-stage trial showed that the vaccine, mRNA-1273, produced high levels of binding and neutralizing antibodies that declined slightly over time, but remained elevated in all participants three months after the booster vaccination, the company said.
The drugmaker’s shares were down about 2% at $154.4 after the bell.
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