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Washington, May 23: President Donald Trump has labeled churches and other houses of worship as “essential" and called on governors nationwide to let them reopen this weekend even though some areas remain under coronavirus lockdown.

The president threatened Friday to “override” governors who defy him, but it was unclear what authority he has to do so.

“Governors need to do the right thing and allow these very important essential places of faith to open right now — for this weekend," Trump said at a hastily arranged press conference at the White House. Asked what authority Trump might have to supersede governors, White House press secretary Kayleigh McEnany said she wouldn't answer a theoretical question.

Trump has been pushing for the country to reopen as he tries to reverse an economic free fall playing out months before he faces reelection. White evangelical Christians have been among the president's most loyal supporters, and the White House has been careful to attend to their concerns throughout the crisis.

Following Trump's announcement, the Centers for Disease Control and Prevention released new guidelines for communities of faith on how to safely reopen, including recommendations to limit the size of gatherings and consider holding services outdoors or in large, well-ventilated areas.

Public health agencies have generally advised people to avoid gatherings of more than 10 people and encouraged Americans to remain 6 feet (1.8 meters) away from others when possible. Some parts of the country remain under some version of remain-at-home orders.

In-person religious services have been vectors for transmission of the virus. A person who attended a Mother's Day service at a church in Northern California that defied the governor's closure orders later tested positive, exposing more than 180 churchgoers. And a choir practice at a church in Washington state was labeled by the CDC as an early “superspreading" event.

But Trump on Friday stressed the importance of churches in many communities and said he was “identifying houses of worship — churches, synagogues and mosques — as essential places that provide essential services.”

“Some governors have deemed liquor stores and abortion clinics as essential” but not churches, he said. “It's not right. So I'm correcting this injustice and calling houses of worship essential." “These are places that hold our society together and keep our people united,” he added.

Dr. Deborah Birx, coordinator of the White House coronavirus task force, said faith leaders should be in touch with local health departments and can take steps to mitigate risks, including making sure those who are at high risk of severe complications remain protected.

“There's a way for us to work together to have social distancing and safety for people so we decrease the amount of exposure that anyone would have to an asymptomatic," she said.

A person familiar with the White House's thinking who spoke on condition of anonymity to discuss internal deliberations said Trump had called the news conference, which had not been on his public schedule, because he wanted to be the face of church reopenings, knowing how well it would play with his political base.

Churches around the country have filed legal challenges opposing virus closures.

In Minnesota, after Democratic Gov. Tim Walz this week declined to lift restrictions on churches, Roman Catholic and some Lutheran leaders said they would defy his ban and resume worship services. They called the restrictions unconstitutional and unfair since restaurants, malls and bars were allowed limited reopening.

Some hailed the president's move, including Kelly Shackelford, president of the conservative First Liberty Institute.

“The discrimination that has been occurring against churches and houses of worship has been shocking," he said in a statement. "Americans are going to malls and restaurants. They need to be able to go to their houses of worship.” But Rabbi Jack Moline, president of Interfaith Alliance, said it was “completely irresponsible” for Trump to call for a mass reopening of houses of worship.

“Faith is essential and community is necessary; however, neither requires endangering the people who seek to participate in them,” he said.

“The virus does not discriminate between types of gatherings, and neither should the president." Rhode Island Gov. Gina Raimondo, a Democrat, made clear that churches and other houses of worship will not resume in-person services in her state until at least next weekend and said she was skeptical Trump had the authority to impose such a requirement.

“It's reckless to force them to reopen this weekend. They're not ready,” she said. “We've got a good plan. I'm going to stick with it.” New Hampshire Gov. Chris Sununu, a Republican, said he would review the federal guidance, while maintaining a decision rests with him.

"Obviously we'd love to get to the point where we can get those open, but we'll look at the guidance documents and try to make some decisions rather quickly, depending on what it might say,” he said. “It's the governor's decision, of course.”

The CDC more than a month ago sent the Trump administration documents the agency had drafted outlining specific steps various kinds of organizations, including houses of worship, could follow as they worked to reopen safely.

But the White House dragged its feet, concerned that the recommendations were too specific and could give the impression the administration was interfering in church operations.

The guidance posted Friday contains most of the same advice as the draft guidance. It calls for the use of face coverings and recommends keeping worshippers 6 feet from one another and cutting down on singing, which can spread aerosolized drops that carry the virus.

London, May 20: The current physical distancing guidelines of 6 feet may be insufficient to prevent COVID-19 transmission, according to a study which says a mild cough in low wind speeds can propel saliva droplets by as much as 18 feet.

Researchers, including those from the University of Nicosia in Cyprus, said a good baseline for studying the airborne transmission of viruses, like the one behind the COVID-19 pandemic, is a deeper understanding of how particles travel through the air when people cough.

In the study, published in the journal Physics of Fluids, they said even with a slight breeze of about four kilometres per hour (kph), saliva travels 18 feet in 5 seconds.

"The droplet cloud will affect both adults and children of different heights," said study co-author Dimitris Drikakis from the University of Nicosia.

According to the scientists, shorter adults and children could be at higher risk if they are located within the trajectory of the saliva droplets.

They said saliva is a complex fluid, which travels suspended in a bulk of surrounding air released by a cough, adding that many factors affect how saliva droplets travel in the air.

These factors, the study noted, include the size and number of droplets, how they interact with one another and the surrounding air as they disperse and evaporate, how heat and mass are transferred, and the humidity and temperature of the surrounding air.

In the study, the scientists created a computer simulation to examine the state of every saliva droplet moving through the air in front of a coughing person.

The model considered the effects of humidity, dispersion force, interactions of molecules of saliva and air, and how the droplets change from liquid to vapour and evaporate, along with a grid representing the space in front of a coughing person.

Each grid, the scientists said, holds information about variables like pressure, fluid velocity, temperature, droplet mass, and droplet position.

The study analysed the fates of nearly 1,008 simulated saliva droplets, and solved as many as 3.7 million equations.

"The purpose of the mathematical modelling and simulation is to take into account all the real coupling or interaction mechanisms that may take place between the main bulk fluid flow and the saliva droplets, and between the saliva droplets themselves," explained Talib Dbouk, another co-author of the study.

However, the researchers added that further studies are needed to determine the effect of ground surface temperature on the behaviour of saliva in air.

They also believe that indoor environments, especially ones with air conditioning, may significantly affect the particle movement through air.

This work is important since it concerns safety distance guidelines, and advances the understanding of the transmission of airborne diseases, Drikakis said.