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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."

Dubai, Mar 23: The United Arab Emirates announced on Monday it will temporarily suspend all passenger and transit flights amid the novel coronavirus outbreak.

The Emirati authorities "have decided to suspend all inbound and outbound passenger flights and the transit of airline passengers in the UAE for two weeks as part of the precautionary measures taken to curb the spread of the COVID-19", reported the official state news agency, WAM.

It said the decision -- which is subject to review in two weeks -- will take effect in 48 hours, adding: "Cargo and emergency evacuation flights would be exempt."

The UAE, whose international airports in Abu Dhabi and Dubai are major hubs, announced on Friday its first two deaths from the COVID-19 disease, having reported more than 150 cases so far.

Monday's announcement came hours after Dubai carrier Emirates announced it would suspend all passenger flights by March 25.

But the aviation giant then reversed its decision, saying it "received requests from governments and customers to support the repatriation of travellers" and will continue to operate passenger flights to 13 destinations.

Emirates had said it will continue to fly to the United Kingdom, Switzerland, Hong Kong, Thailand, Malaysia, the Philippines, Japan, Singapore, South Korea, Australia, South Africa, the United States and Canada.

"We continue to watch the situation closely, and as soon as things allow, we will reinstate our services," said the airline's chairman and CEO, Sheikh Ahmed bin Saeed Al-Maktoum.

Gulf countries have imposed various restrictions to combat the spread of the novel coronavirus pandemic, particularly in the air transport sector.

The UAE has stopped granting visas on arrival and forbidden foreigners who are legal residents but are outside the country from returning.