At least 20 million people in the US may already have been infected with Covid-19, according to the latest estimate by health officials

The Centres for Disease Control (CDC) says the true number of cases is likely to be 10 times higher than the reported figure.

It comes as the state of Texas halted its reopening as infections and hospitalisations surged.

The US has recorded 2.4 million confirmed infections and 122,370 deaths.

Some southern and western states have been reporting record numbers of cases in recent days.

The University of Washington predicts 180,000 US deaths by October – or 146,000 if 95 percent of Americans wear masks.

What did the CDC say?

“Our best estimate right now is that for every case that was reported, there actually were 10 other infections,” CDC Director Dr Robert Redfield told reporters.

This was because testing was restricted to people with symptoms and asymptomatic carriers were not tested, he said. “We probably recognized about 10 percent of the outbreak by the methods that we use to diagnosis between the March, April and May,” he said.

Dr Redfield said that between 5 percent and 8 percent of the population had been exposed to the virus and urged Americans to keep social distancing, wearing masks and washing hands.

“As we go into the fall, in the winter, these are going to be really, really important defence mechanisms,” he said.

What is happening in Texas?

The state, 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.

“This temporary pause will help our state corral the spread until we can safely enter the next phase of opening our state for business,” he said.

Texas confirmed a record 5996 new cases on Thursday.

There were also 47 new deaths, the highest daily toll for a month.

The state has also seen record number of people requiring hospital treatment for 13 days in a row.

Elective surgery has been suspended in the Houston, Dallas, Austin and San Antonio areas to free up beds

More than 10 percent of the tests carried out over the past week have come back positive.

All but 12 of the state’s 254 counties have reported cases.

Other states, including Alabama, Arizona, California, Florida, Idaho, Mississippi, Missouri, Nevada, Oklahoma, South Carolina and Wyoming, have all recorded record daily increases in the number of confirmed cases this week.

More than 36,000 new US cases were confirmed on Wednesday – not far off the record number of 36,426 cases recorded on 24 April.

SOURCE – RADIO NEW ZEALAND

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