Visitors from eight additional states will be required to quarantine for 14 days when traveling to New York, New Jersey and Connecticut, bringing the total number of states subject to the tri-state area's restrictions to 16.

Why it matters: The tri-state area, the original hub of the coronavirus outbreak in the U.S., has successfully flattened its curve and is beginning to reopen. Officials fear, however, that the surge of cases in others states across the country will erase New York and its neighboring states' progress.

The big picture: "The quarantine applies to any person arriving from a state with a positive test rate higher than 10 per 100,000 residents over a 7-day rolling average or a state with a 10% or higher positivity rate over a 7-day rolling average," Gov. Andrew Cuomo said in a press release.

Full list (***new states)

1. Alabama
2. Arkansas
3. Arizona
4. California***
5. Florida
6. Georgia***
7. Iowa***
8. Idaho***
9. Louisiana***
10. Mississippi***
11. North Carolina
12. Nevada***
13. South Carolina
14. Tennessee***
15. Texas
16. Utah

Go deeper: New Jersey pauses reopening process as coronavirus cases surge in other states

Editor's note: This story has been updated to note that New Jersey and Connecticut will also require travelers from these states to quarantine, in addition to New York.