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Islamabad, Jun 10: The World Health Organization has told Pakistan it should implement "intermittent" lockdowns to counter a surge in coronavirus infections that has come as the country loosens restrictions, officials said.

Since the start of Pakistan's outbreak in March, Prime Minister Imran Khan opposed a nationwide lockdown of the sort seen elsewhere, arguing the impoverished country could not afford it.

Instead, Pakistan's four provinces ordered a patchwork of closures, but last week Khan said most of these restrictions would be lifted.

Health officials on Wednesday declared a record number of new cases in the past 24 hours. The country has now confirmed a total of more than 113,000 cases and 2,200 deaths -- though with testing still limited, real rates are thought to be much higher.

"As of today, Pakistan does not meet any of the pre-requisite conditions for opening the lockdown", the WHO said in a letter confirmed by Pakistan officials on Tuesday.

Many people have not adopted behavioural changes such as social distancing and frequent hand-washing, meaning "difficult" decisions will be required including "intermittent lockdowns" in targeted areas, the letter states.

Some 25 percent of tests in Pakistan come back positive for COVID-19, the WHO said, indicating high levels of infection in the general population.

The health body recommended an intermittent lockdown cycle of two weeks on, two weeks off.

Responding to the WHO's letter, Zafar Mirza, the prime minister's special advisor for health, said the country had "consciously but gradually" eased lockdowns while enforcing guidelines in shops, mosques and public transport.

"We have to make tough policy choices to strike a balance between lives and livelihoods," Mirza said Wednesday.

Punjab's provincial health minister Yasmin Rashid, who received the WHO's letter, said the provincial government had already given "orders to take strict action against those violating" virus guidelines.

Hospitals across Pakistan say they are at or near capacity, and some are turning COVID-19 patients away.

WHO Director-General Tedros Adhanom Ghebreyesus said Monday that 136,000 cases had been reported in the previous 24 hours, "the most in a single day so far", with the majority of them in South Asia and the Americas.

Beijing, May 24: The Chinese virology institute in the city where COVID-19 first emerged has three live strains of bat coronavirus on-site, but none match the new contagion wreaking chaos across the world, its director has said.

Scientists think COVID-19 -- which first emerged in Wuhan and has killed some 340,000 people worldwide -- originated in bats and could have been transmitted to people via another mammal.

But the director of the Wuhan Institute of Virology told state broadcaster CGTN that claims made by US President Donald Trump and others that the virus could have leaked from the facility were "pure fabrication".

"Now we have three strains of live viruses... But their highest similarity to SARS-CoV-2 only reaches 79.8 percent," she said, referring to the coronavirus strain that causes COVID-19.

US demands immediate start to WHO review

The United States called on the World Health Organisation on Friday to begin working immediately on investigating the source of the novel coronavirus, as well as its handling of the response to the pandemic.

One of their research teams, led by Professor Shi Zhengli, has been researching bat coronaviruses since 2004 and focused on the "source tracing of SARS", the strain behind another virus outbreak nearly two decades ago.

"We know that the whole genome of SARS-CoV-2 is only 80 percent similar to that of SARS. It's an obvious difference," she said.

"So, in Professor Shi's past research, they didn't pay attention to such viruses which are less similar to the SARS virus."

Conspiracy rumours that the biosafety lab was involved in the outbreak swirled online for months before Trump and US Secretary of State Mike Pompeo brought the theory into the mainstream by claiming that there is evidence the pathogen came from the institute.

The lab has said it received samples of the then-unknown virus on December 30, determined the viral genome sequence on January 2 and submitted information on the pathogen to the WHO on January 11.

Wang said in the interview that before it received samples in December, their team had never "encountered, researched or kept the virus."

"In fact, like everyone else, we didn't even know the virus existed," she said. "How could it have leaked from our lab when we never had it?"

The World Health Organization said Washington had offered no evidence to support the "speculative" claims.

In an interview with Scientific American, Shi said the SARS-CoV-2 genome sequence did not match any of the bat coronaviruses her laboratory had previously collected and studied.