The US has recorded a one-day total of 34,700 new confirmed COVID-19 cases, the highest level since late April, when the number peaked at 36,400, according to Johns Hopkins University.
It comes as three US states announced they are imposing quarantine measures on visitors from states with high coronavirus infection rates, as forecasts predict nearly 180,000 deaths by October.
The worrying prediction was made by the Institute for Health Metrics and Evaluation at the University of Washington.
In a joint news conference, the governors of New York, New Jersey and Connecticut said a 14-day self-quarantine would apply to those visiting from Alabama, Arkansas, Arizona, Florida, North Carolina, South Carolina, Texas, Washington
New Jersey Governor Phil Murphy said the measures were “a smart thing to do”, adding: “We have taken our people, the three of us from these three states, through hell and back, and the last thing we need to do right now is subject our folks to another round.”
Andrew Cuomo, New York’s governor, said the quarantine will apply to any state where 10 out of 100,000 people are testing positive on a rolling seven-day basis, or where 10% of the population is testing positive.
At least 26 US states are seeing a rise in COVID-19 cases compared with the previous week, according to data from Johns Hopkins University.
Health authorities in Texas reported more than 5,000 cases in a single day, breaking the state’s previous record.
Governor Greg Abbott told local media the spread of the virus was “rampant”, saying: “Unless you do need to go out, the safest place for you is at your home.”
California recorded 5,019 new cases on Monday, topping its daily record for the fourth time in the space of a week.
In Arizona, there were 3,591 new cases in a day, and a further 3,289 cases were confirmed in Florida.
More than 2,347,000 coronavirus cases have been confirmed in the US in total, and at least 121,225 people have died, according to Johns Hopkins.
New York City, once the epicentre of the national epidemic, now has one of the lowest transmission rates in the country.
Data from COVID Act Now shows New York and New Jersey are two of three states on track to contain the virus.
Some states which lifted their restrictions early to protect their economies have now seen a renewed surge in infections.
White House adviser Kellyanne Conway said “hotspot spikes” were emerging in certain areas around the country, but denied there would be another “economic lockdown”.
According to a New York Times report, European Union nations are considering a ban on travellers from the US, as well as Russia and Brazil, as they reopen to visitors.