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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, Jan 17: Airports in Srinagar and Jammu are to be “immediately” brought under the security cover of the CISF in view of the arrest of DSP Davinder Singh, a Jammu and Kashmir government order has said.

The two sensitive airports are to be “handed over” to the CISF by January 31, the order of the Jammu and Kashmir Home Department to the Director General of Police (DGP) said.

“This issue (CISF security at Srinagar and Jammu airports) has acquired immediacy in view of the recent developments relating to the arrest of Davinder Singh, DSP airport security, for trying to assist militants to travel to other parts of the country,” the order issued on Wednesday said.

Police had arrested Singh, a deputy superintendent of police, at Mir Bazar in Jammu and Kashmir’s Kulgam district on Saturday, along with Hizbul Mujahideen terrorists Naveed Baba and Altaf, besides a lawyer who was operating as an overground worker for terror outfits.

The two airports are guarded by the CRPF and the J-K Police at present.

The Union government had last year decided that the Central Industrial Security Force (CISF) will be handed over security of these two airports along with the one in Leh in view of their sensitive and strategic location and the threats it faced related to possible terrorist and hijack attempts.

CISF is the national civil aviation security force and at present it guards 61 airports including the ones at Delhi and Mumbai.

News agency had on January 13 reported that the Union home ministry sanctioned about 800 personnel to the CISF in order to take over security duties at the three airports of the newly created Union Territories of Jammu and Kashmir and Ladakh.

As per the original plan, the CISF was to take over Jammu airport by next month and the Srinagar and Leh airports after the spell of severe cold ends.

However, officials said, keeping in mind the arrest of the DSP and his alleged links, the latest order has been issued which also directs the J-K Police to make arrangements for accommodation, transport and other logistical requirements of the armed contingent of the CISF on a quick basis.

Once inducted at the most-sensitive Srinagar airport, the CISF will secure access control at both city and air side (tarmac area) while the CRPF will be responsible for securing the outer periphery. At the Jammu airport, the peripheral security duties will be rendered by the JK Police.

An assortment of surveillance and security gadgets like CCTVs, observation monitors, hand-held metal detectors, bullet-proof patrol vehicles and bomb detection and disposal equipment are also being provided by the airport operator, the Airports Authority of India (AAI), to the CISF.

The Union government sometime back made it clear that CISF will be the only civil airports guarding force and all such facilities in the country will be gradually brought under its command to bolster aviation security and tighten anti-terror and anti-hijack protocols.