Michigan and Washington are the latest US states to bring in strict measures to try and curb the spread of Covid-19.
High schools and colleges are to halt on-site teaching and restaurants are prohibited from offering indoor dining in Michigan from Wednesday.
Indoor restaurant dining is also banned in Washington State, and gyms, cinemas, theatres and museums will close.
Covid cases have now topped 11 million in the US, with hospital admissions at record levels.
On average, more than 1,000 people a day are dying with the virus, and the overall death toll is close to 250,000.
The Trump administration struck an optimistic note on Friday, saying it hoped to distribute 20 million doses of an approved vaccine in December, and for each month after that – although vaccines have yet to get official approval.
But aides to President-elect Joe Biden say the White House’s refusal to facilitate a presidential transition means his team is being excluded from planning around a vaccination campaign that will be a priority for Mr Biden when he takes office in January.
“Our experts need to talk to those people as soon as possible so nothing drops in this change of power we’re going to have on January 20th,” the president-elect’s chief of staff Ron Klain was quoted as saying by the Associated Press news agency.
Mr Klain said the Biden team would nonetheless start talking to vaccine manufacturers, including Pfizer.
President Donald Trump has continued to claim he won the 3 November election, tweeting late on Sunday night: “I WON THE ELECTION!”
Twitter affixed a warning label to the tweet reading: “Official sources called this election differently.”
Mr Trump has ruled out putting the nation into lockdown, but many states are introducing their own restrictions as fast rising cases threaten to overwhelm their healthcare systems.
How worried are the state governors?
Both Michigan and Washington State have seen Covid cases double in recent weeks.
Michigan’s Governor Gretchen Whitmer said the state was “at the precipice” and could soon suffer 1,000 coronavirus-related deaths a week unless action is taken.
As well as suspending in-person teaching and indoor dining, Ms Whitmer also ordered the closure of public entertainment venues for a period of three weeks.
The curbs announced in Washington State come into effect on Monday evening and will last a month.
“Today, Sunday, November 15, 2020, is the most dangerous public health day in the last 100 years of our state’s history,” Governor Jay Inslee said.
“A pandemic is raging in our state. Left unchecked, it will assuredly result in grossly overburdened hospitals and morgues; and keep people from obtaining routine but necessary medical treatment for non-Covid conditions.”