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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."

Washington, Feb 28: US intelligence agencies are monitoring the global spread of coronavirus and the ability of governments to respond, sources familiar with the matter said on Thursday, warning that there were concerns about how India would cope with a widespread outbreak.

While there are only a few known cases in India, one source said the country's available countermeasures and the potential for the virus to spread given India's dense population was a focus of serious concern.

US intelligence agencies are also focusing on Iran, where the country's deputy health minister has fallen ill during a worsening outbreak.

US Secretary of State Mike Pompeo said on Tuesday the United States was "deeply concerned" Tehran may have covered up details about the spread of coronavirus. A US government source said Iran's response was considered ineffective because the government only has minimal capabilities to respond to the outbreak.

Another source said US agencies were also concerned about the weak ability of governments in some developing countries to respond to an outbreak.

The US House of Representatives Intelligence Committee has received a briefing on the virus from the spy agencies. "The Committee has received a briefing from the IC (intelligence community) on coronavirus, and continues to receive updates on the outbreak on a daily basis," an official of the House Intelligence Committee told Reuters.

"Addressing the threat has both national security and economic dimensions, requiring a concerted government-wide effort and the IC is playing an important role in monitoring the spread of the outbreak, and the worldwide response," the official added.

A source familiar with the activities of the Senate Intelligence Committee, led by Republican Senator Richard Burr and Democratic Senator Mark Warner, said the panel was receiving daily updates. The role of US intelligence agencies in responding to the coronavirus epidemic at this point principally involves monitoring the spread of the illness around the world and assessing the responses of governments.

They are working closely with health agencies, such as the US Center for Disease Control, in sharing information they collect and targeting further intelligence gathering.

One source said US agencies would use a wide range of intelligence tools, ranging from undercover informants to electronic eavesdropping tools, to track the virus' impact.

May 29: A total of 367 domestic flights, carrying 30,136 passengers, operated throughout the country till 5 pm on Thursday, Civil Aviation Minister Hardeep Singh Puri said.

Airports in West Bengal also started operations on Thursday, three days after domestic air travel resumed in India after a gap of two months.

All scheduled domestic passenger services were suspended in India from March 25 to May 24 due to restrictions in the wake of the coronavirus pandemic.

Earlier in the day, Puri had said that 460 domestic flights carrying 34,336 passengers were operated on Wednesday.

In the case of West Bengal, the minister on Sunday had said that the state will handle domestic flights from Thursday.

"Figures for domestic flights for 28th May 2020 are in. Departures 367, 30,136 passengers handled. Arrivals 310, 25,530 passengers handled. Total movements 677 with 55,666 passenger footfalls at airports.

 “Total number of flyers 30,136. These are numbers till 1700 hrs for Day 4," Puri said in a tweet.

A total of 428 domestic flights carrying 30,550 passengers and 445 domestic services carrying 62,641 flyers were operated in the country on Monday and Tuesday, respectively.

In February this year, when the lockdown was not imposed, around 4.12 lakh passengers travelled daily through domestic flights in India, according to Directorate General of Civil Aviation (DGCA) data.

During the pre-lockdown period, Indian airports handled around 3,000 daily domestic flights, aviation industry sources said. A total of 16 asymptomatic passengers on seven different flights including 13 of them who travelled by IndiGo have tested positive for COVID-19 since the resumption of domestic air services on Monday, according to airlines data.

Two of the three asymptomatic passengers who tested positive for the infection had travelled by Spicejet while one took a flight of Air India subsidiary Alliance Air.

The Karnataka government, meanwhile, said on Thursday it has requested the civil aviation ministry to reduce the number of flights originating from five states--Maharashtra, Gujarat, Tamil Nadu, Madhya Pradesh and Rajasthan--in the light of the high number of COVID-19 cases there, hours after a minister said it has "suspended" air travel from these states.

Seeking to clarify his statement, Law and Parliamentary Affairs Minister J C Madhuswamy maintained that Karnataka has not sought imposing a ban on flights from the five states as reported in some sections of the media. "India is flying high. Domestic operation figures for May 27, 2020 (till 23.59 hrs): Departures 460 with 34,336 passengers handled. Arrivals 464 with 33,525 passengers handled," Puri had said earlier in the day on Twitter.

If a flight takes off before midnight and lands in another airport after midnight, its departure and arrival are counted on different days, leading to a seeming mismatch in the figures of a particular day.

The Delhi airport, India's busiest airport, is scheduled to handle 147 departures and 145 arrivals on Thursday, said senior government officials. The Mumbai airport's operator MIAL said it handled a total of 50 domestic flights on Thursday. International passenger flights continue to remain suspended in the country.

Airports in West Bengal, Andhra Pradesh, Maharashtra, Telangana and Tamil Nadu have been allowed to handle a restricted number of daily flights as these states do not want a huge influx of flyers amid the rising number of COVID-19 cases.

While domestic services resumed in Andhra Pradesh on Tuesday, they restarted in West Bengal on Thursday.

Though domestic flight operations across the country began on May 25, they could not be restarted in Kolkata and Bagdogra as the state's machinery was involved in relief and restoration work after cyclone Amphan's devastation.

"Welcome Back, Passengers! Kolkata Airport saw the arrival of 122 passengers from @DelhiAirport after two long months and 40 passengers departed to Guwahati. Proper checks were followed, and regular sanitization was carried out in the terminal which was abuzz with passengers," the Kolkata airport tweeted.

On Thursday, eleven flights took off from Kolkata and an equal number arrived in the city, sources at the Netaji Subhas Chandra Bose International Airport said.

"A total of 1,745 passengers arrived and 1,214 passengers flew out of the city today (Thursday)," airport sources said.

The airports in Kolkata and Bagdogra are permitted to handle 20 daily flights each from Thursday onwards.

While it is not clear how many flights were handled by the Bagdogra airport on Thursday, the officials said 899 passengers arrived while 484 passengers departed from the airport during the day.

The West Bengal government recently came up with a set of guidelines for people arriving in the state on domestic flights.

According to it, those entering the state from Thursday must submit a self-declaration form, stating that they have not tested positive for COVID-19 in the past two months.

The passengers will also need to undergo health screening after they arrive at the airport, the state's guidelines said.