Thanks a lot to the hard work of so many people, COVID cases are down in all fifty states," Biden said.

"We're not done fighting this virus," he added. "We still have tens of millions left to vaccinate. But we are making significant progress."

He praised the nation's vaccination program, which he credited with delivering at least one dose of a vaccine to sixty percent of Americans.

Biden urged Americans to continue to seek out the free vaccines, to protect themselves and their communities.

"Every day, the light at the end of that tunnel is growing brighter," he said.

ALSO SEE: Tracking coronavirus vaccinations and outbreaks in the U.S. --Reuters

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States in the Northeast, after experiencing spikes in coronavirus infections earlier this year, are reporting significant drops in cases and hospitalizations.

Connecticut, Massachusetts, Pennsylvania and Rhode Island have all reported many fewer cases in recent weeks as more people receive vaccinations. New York and New Jersey have also seen steady declines in cases after struggling to contain the virus earlier this spring.

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State and federal lawmakers, with the support of unions, are looking to survivor registries created after 9/11 as a model for helping potentially millions of people with often-debilitating long-term symptoms of Covid-19.