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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."

Udupi, Mar 30: Karnataka Home Minister and Udupi district in-charge Basavaraj Bommai has urged citizens to stay indoors and help government prevent spread of Covid-19.

In a video released by the Minister on Monday, he said, ''Three patients have been cured and we are observing their situation. All the primary contacts of these patients have been quarantined.''

''In Dr TMA Pai Hospital a 100-bed COVID hospital has been set up and a 150-bed SDM hospital in Udyavara is ready to use as isolation facilities,'' he added.

Bengaluru, Mar 30: Chief Minister B S Yediyurappa on Sunday convened an all-party meeting and apprised the Opposition leaders about the measures taken by the government to contain the coronavirus in the state.

"I have been regularly holding meeting since March 13 regarding the measures taken to contain the transmission of COVID-19," the chief minister said at the meeting at the Vidhana Soudha.

Health Minister B Sriramulu, Medical Education Minister Dr K Sudhakar, IT-BT Minister C N Aswath Narayan, Deputy Chief Minister Laxman Savadi, former chief minister and Leader of the Opposition Siddaramaiah, Opposition MLAs H D Revanna, D K Shivakumar and former speaker K R Ramesh Kumar attended the meeting.

The chief minister said a task force comprising ministers and officials has been formed to oversee the implementation of the government orders.

Yediyurappa highlighted the prevailing situation across the globe saying that normal life had been paralysed everywhere.

The chief minister also apprised them about the number of clinics all over the state, availability of medicines and protection gear for the doctors and quarantine rooms in the state.