The US has now surpassed six million cases of Covid-19 – almost a quarter of the world’s total, according to America’s Johns Hopkins University.
It said the country added one million new infections in less than a month. More than 183,000 people have now died.
In the UK, France and Spain, the infection rate dropped compared with Sunday’s figures – but the tallies may be readjusted later on.
It comes as children across Europe prepare to return to schools this week.
Global infection cases have now surpassed 25 million, with more than 846,000 Covid-19 related deaths.
Meanwhile, the World Health Organization (WHO) warned that the emergency authorisation of vaccines required a “great deal of seriousness and reflection”.
The UN body’s chief scientist, Soumya Swaminathan, said every country had the right to approve drugs without full trial, but it was “not something that you do lightly”.
The WHO says that 33 potential vaccines are currently up for clinical trials, and a further 143 are in pre-clinical evaluation.
On Monday, Johns Hopkins reported that there were now more than six million coronavirus cases across the US.
The university – which has been collecting US and global coronavirus data since the outbreak began late last year in China – reported the first infection in America on 21 January.
The country reached its one-million mark in 99 days, on 28 April, and 43 days after that the number of infections doubled.
Three million cases were confirmed within the next 28 days, rising to four million on 23 July, after only 15 additional days.
The five-million mark was surpassed in another 17 days and it took the US 22 more days to top six million infections.
Although the number of new daily cases has been declining in recent weeks, the US remains by far the world’s worst-hit nation.
President Donald Trump’s administration has been repeatedly criticised over its handling of the outbreak.
But White House press secretary Kayleigh McEnany said the US was coping well with the pandemic.
“We are encouraged to see a drop in cases, deaths, hospitalisations,” she told reporters at Monday’s news briefing.
Ms McEnany said America had “one of the lowest case fatality rates in the world”, adding that “our therapeutics are working and saving lives”.