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Early Data Show Moderna’s Coronavirus Vaccine Is 94.5% Effective

The drugmaker Moderna announced on Monday that its coronavirus vaccine was 94.5 percent effective, based on an early look at the results from its large, continuing study.

Researchers said the results were better than they had dared to imagine. But the vaccine will not be widely available for months, probably not until spring.

Moderna is the second company to report preliminary data on an apparently successful vaccine, offering hope in a surging pandemic that has infected more than 53 million people worldwide and killed more than 1.2 million. Pfizer, in collaboration with BioNTech, was the first, reporting one week ago that its vaccine was more than 90 percent effective.

Pfizer and Moderna were the first to announce early data on large studies, but 10 other companies are also conducting big Phase 3 trials in a global race to produce a vaccine, including efforts in Australia, Britain, China, India and Russia. More than 50 other candidates are in earlier stages of testing.

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