N.Y., N.J. and Conn. to require travelers from 31 states to quarantine

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 reopening.

• Officials fear, however, that the surge of cases in others states across the country could erase progress.
• New York City will set up bridge and tunnel checkpoints to enforce the quarantine order, per Mayor Bill de Blasio.

What they're saying: "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:

1. Alabama
2. Arizona
3. Arkansas
4. California
5. Florida
6. Georgia
7. Hawaii
8. Idaho
9. Illinois
10. Indiana
11. Iowa
12. Kansas
13. Kentucky
14. Louisiana
15. Maryland
16. Minnesota
17. Mississippi
18. Missouri
19. Montana
20. Nebraska
21. Nevada
22. North Carolina
23. North Dakota
24. Oklahoma
25. Puerto Rico
26. South Carolina
27. South Dakota
28. Tennessee
29. Texas
30. Utah
31. Virginia
32. Virgin Islands
33. Wisconsin

Editor's note: This story has been updated to note additional states added to the quarantine list. It has also been corrected to clarify that the list includes 31 states and Puerto Rico and the Virgin Islands.