States like Florida are experiencing rates of infection not seen since April. (BBC)
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Washington – The United States recorded an all-time daily high of 40 000 novel coronavirus (COVID-19) infections on Thursday, figures from Johns Hopkins University (JHU) show.
A recent surge in infections and hospitalisations has prompted the states of Texas, Florida and Arizona to pause reopening plans.
Texas's governor ordered bars to close and announced other "targeted measures" on Friday to bring infections down.
Florida announced it was suspending alcohol consumption at its bars.
JHU's previous high of 36 400 was on April 24 when less testing took place.
The US has 2.4 million confirmed infections and 122 370 deaths – more than any other country.
While some of the increase in daily cases recorded is down to increased testing, the rate of positive tests in some areas is also increasing.
Health officials in the US estimate the true number of cases is likely to be ten times higher than the reported figure.
The Centre for Disease Control (CDC) said up to 20 million Americans may have been infected with coronavirus. The estimate was based on blood samples collected from across the country which were tested for the presence of antibodies to the virus.
The surge in cases was being driven by young people testing positive, especially in the south and west of the US, said the head of the CDC, Dr Robert Redfield.
Which states are worst hit?
Texas, which has been at the forefront of moves to end lockdown measures, has seen thousands of new cases, prompting Republican Governor Greg Abbott to call a temporary halt to its reopening on Friday.
He announced that he was closing bars, stopping river-rafting, and ordering restaurants to return to 50 per cent capacity to try to stem the outbreak.
"It is clear that the rise in cases is largely driven by certain types of activities, including Texans congregating in bars," he said in a statement.
Texas confirmed a record 5 996 new cases on Thursday, while there were also 47 more deaths reported, the highest daily toll for a month.
On Friday, Florida broke its own daily record for new infections, reporting 8 942 new cases. The previous record was 5 508, reported on Wednesday. The state now has a total of 122 960 recorded cases and 3 366 deaths.
State officials announced that alcohol consumption was being suspended at bars across the state. However, it was not clear how the new measures would affect restaurants that served alcohol, the Miami Herald reported.
Earlier, Florida's governor said there was no plan to continue reopening step-by-step. "We are where we are. I didn't say we were going to go on to the next phase," Ron DeSantis told reporters.
Arizona has emerged as another epicentre of the crisis.
Disease trackers there say the state has "lost control of the epidemic", the Washington Post reports. Governor Doug Ducey, who had been giving businesses a "green light" to reopen, now says Arizona residents are "safer at home".
The light is at "yellow", Ducey said on Thursday. "I'm asking for Arizonans to proceed with caution, to go slower, to look both ways."
Other states, including Alabama, California, Idaho, Mississippi, Missouri, Nevada, Oklahoma, South Carolina and Wyoming, have all seen record daily increases in the number of confirmed cases this week. (BBC)