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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."

Feb 2: The Supreme court on Monday decided to hear on March 4 a plea seeking registration of FIRs against politicians for hate speeches which allegedly led to violence in the national capital.

A bench headed by Chief Justice S A Bobde agreed to hear the plea filed by riots victims.

The petition was mentioned for urgent listing by senior advocate Colin Gonsalves, appearing for the riots victims.

Gonsalves said that the Delhi High Court has deferred for four weeks the matters related to riots in the national capital despite the fact that people are still dying due to the recent violence.

Mumbai, Mar 9: The mayhem in domestic stock markets deepened with the BSE Sensex falling over 2,400 points and the Nifty50 trading below 10,400 points.

The plunge in the domestic indices was in line with the global markets on persistent fears of economic impact of the coronavirus epidemic.

Stocks of Reliance Industries registered the biggest fall in over 10 years as it fell to Rs 1,094.95 per share. At 1.34 p.m., it was trading at Rs 1,100, lower by Rs 170.05 or 13.39 per cent from its previous close. The stock fell most since October 2008.

The benchmark index of BSE Sensex was trading at 35,232.67 points, lower by 2,343.95 points or 6.24% from the previous close of 37,576.62 points. 

It had opened at the intra-day high of 36,950.20 and has so far touched a low of 35,109.18.

The Nifty50 on the National Stock Exchange was trading at 10,314.25 points, lower by 675.20 points or 6.14% from the previous close. 

It was a sell-off across sectors, led by financial, metal, energy and IT stocks - which weighed on the markets.

Further, crude oil prices also slumped around 30% on Monday as Organization of Petroleum Exporting Countries (OEPC) failed to agree on an output cut deal, eventually causing Saudi Arabia to cut its prices as it is likely to increase its production. Saudi Arabia's stance has already raised concerns of an all-out price war.

Brent crude futures are currently trading around $34 per barrel.

On Saturday, Saudi Arabia announced massive discounts to its official selling prices for April, and the nation is reportedly preparing to increase its production above the 10 million barrel per day mark, according to reports.

As per analysts, the oil market witnessed the worst price fall on Monday since the 1991 Gulf War.