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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."

New Delhi, Feb 10: A 44-year-old man allegedly killed his daughter and son before ending his life by jumping in front of a Delhi metro train at Haiderpur Badli Mor station on Sunday, police said.

No suicide note has been recovered, but police claimed that the man, Madhur Malani, was depressed since his sandpaper-manufacturing factory was closed some six months ago due to financial crunch leaving him jobless. Madhur's parents had been supporting his family financially since then.

He used to stay with his wife Rupali, daughter Samiksha (14) and six-year-old son Shraiyans at a rented house in northwest Delhi's Shalimar Bagh area, they said.

Rupali was not at home when Madhur strangled their children. He might have also smothered their daughter but the exact cause of death would be ascertained only after the post-mortem reports arrive, a police official said.

After killing his two children, he jumped in front of an approaching train at Haiderpur Badli Mor Metro station following which he was rushed to a hospital where doctors declared him 'brought dead', the official said.

Metro services on the Yellow Line were briefly delayed due to the incident.

"Delay in services from Samaypur Badli to GTB Nagar due to a passenger on track at Haiderpur Badli Mor," the Delhi Metro Rail Corporation (DMRC) tweeted.

After about 15 minutes, it again tweeted that normal services have been restored. The Delhi Metro's Yellow Line connects Samaypur Badli in Delhi to HUDA City Centre in Gurgaon.

The suicide was reported to the police around 5.40 pm while the Shalimar Bagh Police station received a call about the killings around 6.50 pm.

On reaching the house, police found bodies of the children lying in beds in two rooms. During enquiry, it was learnt that their father has left the house, a senior police officer said.

While police were trying to trace Madhur, they learnt about a suicide at the metro station. On verifying the details, it surfaced that Madhur committed suicide after killing his children, the officer said.

Rupali told police that she had gone to a nearby market around 3 pm and on returning home she found the bodies of her children while her husband was missing.

A case under relevant sections of the IPC has been registered and investigation was underway, Deputy Commissioner of Police (Northwest) Vijayanta Arya said.