The U.S. added a second COVID-19 vaccine to its arsenal Friday, boosting efforts to beat back an outbreak so dire that the nation is regularly recording more than 3,000 deaths a day the Associated Press reported.

Much-needed doses are set to arrive Monday in the USVI after the Food and Drug Administration authorized an emergency rollout of the vaccine developed by Moderna Inc. and the National Institutes of Health.

The move marks the world’s first authorization for Moderna’s shots. The vaccine is very similar to one from Pfizer Inc. and Germany’s BioNTech that’s now being dispensed to millions of health care workers and nursing home residents as the biggest vaccination drive in U.S. history starts to ramp up.

Vaccine appears safe - NHI

The two work “better than we almost dared to hope,” NIH Director Dr Francis Collins told The Associated Press. “Science is working here, science has done something amazing.”

Early results of large, still unfinished studies show both vaccines appear safe and strongly protective although Moderna’s is easier to handle since it doesn’t need to be stored at ultra-frozen temperatures.

A second vaccine represents a ray of hope amid despair as the virus continues to spread unabated even before holiday gatherings that are certain to further fuel the outbreak.

The scourge has claimed more than 312,000 U.S. lives and killed 1.7 million people worldwide. New cases in the U.S. are running at over 216,000 per day on average.