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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."

London, May 9: Air India's first evacuation flight from London will be taking off for Mumbai today.

The screening of passengers is underway.

"Air India's first evacuation flight from London taking off for Mumbai today at 1200. Flight is 100% booked! Shubh Yatra. Please stay in touch. GoI working to send more evacuation flights!" High Commission of India, London said in a tweet.

On Monday, India announced had that it will begin phased repatriation of its citizens stranded abroad from May 7.

The government said that Air India will operate 64 flights in the first week from May 7 to May 13 to bring back around 15,000 Indian nationals.

On day three of the 'Vande Bharat Mission', flights carrying Indians from the Gulf countries, the United Kingdom, Bangladesh and Malaysia will arrive in India.

Wuhan, Jan 20: A 45-year-old Indian woman has become the first foreigner in China to have contracted a mysterious virus, which is suspected to be Severe Acute Respiratory Syndrome (SARS)-like corona virus.

In 2002-2003, the SARS corona virus killed around 650 people in China and Hong Kong. This time, a new strain of virus with 62 cases have been reported in Wuhan and two in Shenzhen so far. 19 patients have been already cured and discharged, as per the Chinese media.

Official sources in Beijing said that the patient, Preeti Maheshwari, a school teacher at an international school, is undergoing treatment for the new strain of pneumonia outbreak, which has been spreading in two major cities of China - Wuhan and Shenzen. She has been on a ventilator in the intensive care unit.

Maheshwari was admitted to a local hospital after she seriously fell ill last Friday. Her husband, a businessman from Delhi, is allowed to visit her daily.

Following a second death due to the outbreak of the virus in Wuhan, India on Friday issued an advisory to its nationals travelling to China. Over 500 Indian medical students are studying in Wuhan.