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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."

Mumbai, Apr 4: As many as six Central Industrial Security Force (CISF) personnel stationed at Mumbai airport in Maharashtra have tested positive for coronavirus, taking the total number of positive cases among the central force to 11. The first case of a CISF jawan being diagnosed with the viral disease was reported on March 28. 

After the first case, the armed police force reported four more cases of COVID-19 among the personnel stationed at the airport on Thursday. On the same day, the CISF collected samples of 146 staff and sent them to Kasturba hospital for testing. The results, which arrived on Friday, recorded six more COVID-19 cases among, reported news agency.

The personnel were posted at Kharghar adjoining Mumbai, a senior official told news agency.

As of now, there are 14 COVID-19 cases in Panvel Municipal Corporation (PMC) area in Mumbai. Kharghar comes under the civic body's jurisdiction.

All the 146 CISF personnel were shifted to a quarantine centre at a facility at Kamothe reported the Times of India.

Maharashtra reported 67 new COVID-19 cases, taking the total tally to 490. A total of 26 deaths have been reported in the state.  

In the meantime, the Centre on Friday said there is no shortage of medical supplies across the country to fight COVID-19 outbreak.

"The government of India is making sure that all the essential medical supplies are in place to fight COVID-19. Sixty-two lifeline Udan flights transported over 15.4 tons of essential medical supplies in the last five days," Union Minister for Chemical and Fertilisers DV Sadanada Gowda said in a tweet.

The government is also paying full attention to the manufacturing activities of essential items like pharmaceuticals and hospital devices. For this, over 200 units in Special Economic Zones (SEZs)  are operational, he added.

"A Central Control Room has also been set up for close monitoring of the distribution of essential medical items and to address logistic related issues," Gowda said.