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London/Milan, Jun 2: World Health Organization experts and a range of other scientists said on Monday there was no evidence to support an assertion by a high profile Italian doctor that the coronavirus causing the COVID-19 pandemic has been losing potency.

Professor Alberto Zangrillo, head of intensive care at Italy's San Raffaele Hospital in Lombardy, which bore the brunt of Italy's COVID-19 epidemic, on Sunday told state television that the new coronavirus "clinically no longer exists".

But WHO epidemiologist Maria Van Kerkhove, as well as several other experts on viruses and infectious diseases, said Zangrillo's comments were not supported by scientific evidence.

There is no data to show the new coronavirus is changing significantly, either in its form of transmission or in the severity of the disease it causes, they said.

"In terms of transmissibility, that has not changed, in terms of severity, that has not changed," Van Kerkhove told reporters.

It is not unusual for viruses to mutate and adapt as they spread, and the debate on Monday highlights how scientists are monitoring and tracking the new virus. The COVID-19 pandemic has so far killed more than 370,000 people and infected more than 6 million.

Martin Hibberd, a professor of emerging infectious disease at the London School of Hygiene & Tropical Medicine, said major studies looking at genetic changes in the SARS-CoV-2 virus that causes COVID-19 did not support the idea that it was becoming less potent, or weakening in any way.

"With data from more than 35,000 whole virus genomes, there is currently no evidence that there is any significant difference relating to severity," he said in an emailed comment.

Zangrillo, well known in Italy as the personal doctor of former Prime Minister Silvio Berlusconi, said his comments were backed up by a study conducted by a fellow scientist, Massimo Clementi, which Zangrillo said would be published next week.

Zangrillo told Reuters: "We have never said that the virus has changed, we said that the interaction between the virus and the host has definitely changed."

He said this could be due either to different characteristics of the virus, which he said they had not yet identified, or different characteristics in those infected.

The study by Clementi, who is director of the microbiology and virology laboratory of San Raffaele, compared virus samples from COVID-19 patients at the Milan-based hospital in March with samples from patients with the disease in May.

"The result was unambiguous: an extremely significant difference between the viral load of patients admitted in March compared to" those admitted last month, Zangrillo said.

Oscar MacLean, an expert at the University of Glasgow's Centre for Virus Research, said suggestions that the virus was weakening were "not supported by anything in the scientific literature and also seem fairly implausible on genetic grounds."

Washington, Jul 1: The United States has approved four coronavirus vaccine candidates for clinical trials, Food and Drug Administration (FDA) head Stephen Hahn told reporters.

"Four vaccines have been approved for moving into clinical trials... and another six are in the pipeline for us to review," Hahn said during a press briefing on Tuesday.

The US Administration launched in May Operation Warp Speed, a joint project of Health and Defense Departments, which aims to deliver 300 million doses of a vaccine for COVID-19 by January 2021.

The country's top pandemics expert Anthony Fauci warned on Tuesday, however, that there is no certainty the United States will be able to develop a vaccine against COVID-19 that works and will be safe.

Data on vaccine effectiveness, he added, may be available in the winter or early next year.

Colorado, Jun 3: Formula One boss Chase Carey has said that races will go ahead even if a driver tests positive for coronavirus.

His remarks come as organisers revealed a revised 2020 calendar and the schedule for the first eight races was put in the public domain.

"An individual having been found with a positive infection will not lead to a cancellation of a race. We encourage teams to have procedures in place so if an individual has to be put in quarantine, we have the ability to quarantine them at a hotel and to replace that individual," the official website of Formula One quoted Carey as saying.

"Some things we'd have to talk through and work through. The array of 'what ifs' are too wide to play out every one of them, but a team not being able to race would not cancel the race. I do not think I could sit here and lay out the consequences," he said.

Carey added the organisers will be having the necessary procedures in place so that the race does not get cancelled if a driver ends up testing positive for coronavirus.

"But we will have a procedure in place that finding infection will not lead to a cancellation. If a driver has an infection, teams have reserve drivers available," Carey said.

"We would not be going forward if we were not highly confident we have necessary procedures and expertise and capabilities to provide a safe environment and manage whatever issues arrive," he added.

The Formula One 2020 season will be beginning with the Austrian Grand Prix in July.

F1 currently expects the opening races to be closed events but hopes that fans will be able to attend again when it is safe to do so.

The season will kick off with the Austrian Grand Prix at the Red Bull Ring on July 5, followed a week later by a second race on the same track.

The Hungarian Grand Prix will follow a week after that, before a break. There will be then two back to back races at Silverstone, followed by the Spanish Grand Prix in Barcelona.

The Belgian Grand Prix will follow that, with the Italian Grand Prix at Monza a week later on September 6.