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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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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

New Delhi, Apr 26: The Centre will bring back the Indian citizens stranded abroad due to the ban on arrival of international passenger aircraft, only if the respective states they belong to agree to allow them to come back home and make necessary arrangements to quarantine them after their return.

The Ministry of External Affairs (MEA) has started consultations with the State Governments on bringing back the Indians, who got stranded in the United States, United Kingdom, France, Italy, Canada and many other foreign countries due to the ban on arrival of international passenger aircraft to any airport in the country. The decision on facilitating their return to the country would be taken after getting feedback on preparedness of the States and the Union Territory to receive them following all required health precautions, Cabinet Secretary Rajiv Gauba said.

Gauba on Saturday had a video-conference with the Chief Secretaries of all States and Union Territories to review the implementation of the restrictions on travel and transport as well as the lockdown imposed across the country to contain the COVID-19 pandemic.

Though the Government earlier either evacuated or facilitated the return of nearly 28000 Indians from a number of foreign countries affected by the COVID-19 pandemic, it almost stopped doing so after the ban on arrival of international passenger aircraft was enforced on March 23 in the wake of the spurt in the number of COVID-19 cases in India.

Thousands of Indian students, tourists, professionals and others are stranded around the world, including in the countries, where respective governments had imposed lockdowns to contain the pandemic. They have been desperately requesting the government on social media to evacuate them.

Bengaluru, Feb 27: Union Minister of State for External Affairs V Muraleedharan on Wednesday said the Union Government will take up the issue of establishing a US consulate in Bengaluru during bilateral talks with the US officials in the future.

Speaking at a seminar on Videsh Sampark here, Mr Muraleedharan said after Delhi and Mumbai, a large number of visa applications come from Bengaluru. “We will take up the issue of establishing a US consulate in Bengaluru during bilateral talks,” he said.

Earlier, the chief secretary of Karnataka TM Vijay Bhaskar urged the centre to consider the state government’s demand of setting up a US Consulate in Bengaluru. At the moment visa applicants have to travel to Chennai for the purpose.