Moderna Says its Vaccine is Highly Effective in Preventing COVID-19

A second COVID-19 candidate vaccine looks to be even more effective than the first, with both protecting more than 90% of those who get the shots.

Moderna, a Cambridge, Massachusetts-based biotechnology company, announced early Monday that its candidate vaccine, mRNA-1273, developed in collaboration with the U.S. government, appears to be 94.5% effective against the disease.

Earlier this month, Pfizer and its German partner BioNTech, announced early effectiveness data, showing their vaccine, called BNT162b2, had protected more than 90% of those who received it.

Both results are preliminary, with final...

Biotechnology firm Moderna announced Monday that a preliminary analysis shows its experimental coronavirus vaccine is nearly 95 percent effective at preventing illness, including severe cases — a striking initial result that leaves the United States with the prospect that two coronavirus vaccines could be available on a limited basis by the end of the year.

The news comes a week after pharmaceutical giant Pfizer and its German partner BioNTech lifted the stock market and people’s hopes with the news that their coronavirus vaccine was more than 90 percent effective.

Based...