Coronavirus: New York imposes quarantine on eight US states
New York, New Jersey and Connecticut have asked people from countries where Covid-19 cases occur to isolate themselves for 14 days.
New Jersey's Phil Murphy said that people in the three states went "through hell and back" and didn't want "another round" of viral infections.
Some southern and western states have reported record numbers of cases.
The University of Washington forecasts 180,000 deaths in the US by October - or 146,000 if 95% of Americans wear masks.
On Wednesday, White House spokesman Judd Deere said the quarantine would not apply to President Trump, who was in Arizona and is expected to be in New Jersey this weekend.
"The President of the United States is not a civilian. Everyone around him, including staff, guests, and the press, will be tested on Covid-19 and confirmed as negative," he said.
Does the US test more people than anywhere else?
Is the pandemic getting worse in the US?
The people fighting the worst coronavirus outbreak in America
So far, the United States has registered more than 2.3 million cases of the virus, and more than 121,000 deaths and health officials say the coming weeks will be crucial to contain the outbreaks.
On Tuesday, America's leading infectious disease expert, Dr. Anthony Fauci, the legislator, that there is "a disruptive wave of infection" and "increasing community spread" in many southern and western states.
He urged the Americans to take social distance measures and said, "Plan A, don't go into the crowd. Plan B, if you do, make sure you wear a mask."
Which countries are subject to quarantine?
Currently, these states are Alabama, Arkansas, Arizona, Florida, North Carolina, South Carolina, Texas, and Utah, New York State governor Andrew Cuomo told reporters.
Persons from these states - including returning residents of New York, New Jersey and Connecticut - are asked to quarantine for 14 days upon arrival.
Anyone who breaks the quarantine could face fines of $ 1,000 (£ 800) that increase to $ 5,000 for repeated violations, Cuomo said. He added that depending on the number of new cases per 100,000 people or the rate of positive tests, U.S. states would be added or removed from the quarantine list.
"This is a smart thing to do," said New Jersey governor Phil Murphy.
"We have brought our people, we three from these three states, through hell and back, and the last thing we have to do now is to put our people through another round."
Washington state was originally added to the list due to a data reporting error - but this was later corrected, said Cuomo's spokeswoman Caitlin Girouard.
Graphic shows where cases rise
Which US states see an increase in cases?
The total number of infections in the US rose a quarter last week. According to the Reuters news agency, 10 states saw cases increase by more than 50%.
On Wednesday, California reported a record 7,149 new confirmed cases, bringing the state's total to 190,222 cases. Governor Gavin Newsom said the state has conducted more than a million tests in the past two weeks, with around 5% positive. Mr. Newsom has prescribed the wearing of a face mask in public.
Walt Disney said it is delaying the reopening of its Disneyland Park and Disney California Adventure Park, which were originally scheduled for July 17. The company said it must first get government officials approval.
Florida also reported a daily record of 5,508 new infections. Florida has a total of 109,014 confirmed infections with 3,281 deaths. In the absence of a nationwide mask requirement, several cities have issued their own regulations requiring masks in public.
Arizona reported 1,795 new infections on Wednesday, compared to 3,600 new infections on Tuesday when President Trump held an election rally in the city of Phoenix.
People are waiting to be tested in Miami Beach. Florida has confirmed nearly 110,000 cases
At the event, Mr. Trump - who was not wearing a mask - insisted that the "plague" of the coronavirus "disappear" and called the virus "kung flu" again, which the White House denies as a racist term.
Arizona officials warn that over 80% of hospital beds are currently in use and that the health care system may be overloaded in the coming days or weeks.
Texas also reported a new daily record of 5,551 confirmed cases on Wednesday, with Governor Greg Abbott warning that the state is facing a "massive outbreak" and that new restrictions may be required in some areas.
More and more people were hospitalized in Texas, and adult virus patients were admitted to a children's hospital in Houston.
Texas Children's Hospital urged the public to "act responsibly - exercise appropriate social distance, wear a mask or face cover when you leave home."
Both Texas and Arizona were among the states to lift the coronavirus restrictions early. Texas has temporarily revoked alcohol approvals from several companies that violate social distance rules.
On Tuesday, Washington state governor Jay Inslee publicly ordered all residents to wear face masks after confirmed infections had increased by more than a third in the past week.
"This is about saving lives. It's about reopening our businesses. And it's about showing respect and mutual care," said Inslee.
The graph shows cases that are increasing in the United States
Several U.S. states and cities have instructed residents to wear facewear.
South Carolina, Utah, Mississippi and Louisiana have also seen increases in case numbers, and some governors have stated that they may be forced to announce new blocking measures.
The European Union is reportedly considering banning US citizens from joining the block because it is considering how to reopen its external borders.
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