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The current physical distancing guidelines provided by the World Health Organisation (WHO) and by the US Centers for Disease Control and Prevention (CDC) may not be adequate to curb the coronavirus spread, according to a research which says the gas cloud from a cough or sneeze may help virus particles travel up to 8 metres. The research, published in the Journal of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.

Study author, MIT associate professor Lydia Bourouiba, warned that droplets of all sizes can travel 23 to 27 feet, or 7-8 metres, carrying the pathogen.

According to Bourouiba, the current guidelines are based on "arbitrary" assumptions of droplet size, "overly simplified", and "may limit the effectiveness of the proposed interventions" against the deadly pandemic.

 She explained that the old guidelines assume droplets to be one of two categories, small or large, taking short-range semi-ballistic trajectories when a person exhales, coughs, or sneezes.

However based on more recent discoveries, the MIT scientist said, sneezes and coughs are made of a puff cloud that carries ambient air, transporting within it clusters of droplets of a wide range of sizes.

Bourouiba warned that this puff cloud, with ambient air entrapped in it, can offer the droplets moisture and warmth that can prevent it from evaporation in the outer environment.

"The locally moist and warm atmosphere within the turbulent gas cloud allows the contained droplets to evade evaporation for much longer than occurs with isolated droplets," she said.

"Under these conditions, the lifetime of a droplet could be considerably extended by a factor of up to 1000, from a fraction of a second to minutes," the researcher explained in the study.

The MIT scientist, who has researched the dynamics of coughs and sneezes for years, added that these droplets settle along the trajectory of a cough or sneeze contaminating surfaces, with their residues staying suspended in the air for hours.

"Even when maximum containment policies were enforced, the rapid international spread of COVID-19 suggests that using arbitrary droplet size cutoffs may not accurately reflect what actually occurs with respiratory emissions, possibly contributing to the ineffectiveness of some procedures used to limit the spread of respiratory disease," Bourouiba wrote in the study

Bengaluru, May 13: Gym and hotels, which had remained closed due to lockdown to combat spread of Coronavirus, would be allowed to function from May 17, Karnataka Minister for Tourism C T Ravi said on Wednesday.

Speaking to the media, after a meeting with Chief Minister B S Yediyurappa here he said that the Chief Minister has agreed to give permission to gym, hotels and golf clubs to function and as they have assured to maintain social distance and follow other guidelines of the lockdown.

Mr Ravi, who is also Minister for Youth Empowerment and Sports, further said that reopening of hotel industry would help in attracting tourists. Opening of gym and fitness centre was important for sports persons and regular exercisers.

Istanbul: Mosques in Turkey reopened on Friday for mass prayers after more than two months as the government further eased strict restrictions to stop the spread of the new coronavirus.

Turkey has been shifting since May to a "new normal" by easing lockdown measures and opening shopping malls, barbershops and hair salons.

President Recep Tayyip Erdogan has said many other sites -- restaurants and cafes as well as libraries, parks and beaches -- will reopen from Monday.

Hundreds of worshippers wearing protective masks performed mass prayers outside Istanbul's historic Blue Mosque for the first time since mosques were shut down in March.

In the Ottoman-era Fatih mosque, worshippers prayed both inside and outside, with the municipality handing out disinfectants and disposable carpets.

"I have waited a lot for this, I have prayed a lot. I can say it's like a new birth, thanks to God, he has brought us back here," he said.

Another worshipper, Asum Tekif, 50, said: "It has a been a long time... we missed the mosques."

Turkey, a country of 83 million, has so far recorded 4,489 coronavirus-related deaths and 162,120 confirmed cases.

Prayers in Hagia Sophia

Muslim clerics on Friday recited prayers in the Hagia Sophia, the world famous Istanbul landmark which is now a museum after serving as a church and a mosque.

The prayers were held to celebrate the anniversary of the conquest of Constantinople, today's Istanbul, by the Ottomans in 1453.

"It is very important to commemorate the 567th anniversary of the conquest ... through prayers in the Hagia Sophia," said President Recep Tayyip Erdogan, who attended the ceremony via videoconference.

The stunning edifice was first built as a church in the sixth century under the Byzantine Empire as the centrepiece of its capital Constantinople.

After the Ottoman conquest, it was converted into a mosque before being turned into a museum during the rule of Mustafa Kemal Ataturk, the founder of modern Turkey, in the 1930s.

But there have been hints about reconverting the Hagia Sophia into a mosque. Last year, Erdogan himself mooted the possibility of turning Hagia Sofia museum into a mosque.

Such calls have sparked anger among Christians and raised tensions with neighbouring Greece.

In 2015, a Muslim cleric recited the Koran in the Hagia Sophia for the first time in 85 years to mark the opening of an exhibition.

After Friday prayers at the Blue Mosque, a small group of Muslim worshippers shouted: "Let the chains break and let the Hagia Sophia open".

The group was later dispersed by the police who stopped them from protesting near Hagia Sophia that sits immediately opposite the Blue Mosque.