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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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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, Apr 13: Karnataka Pradesh Congress Committee (KPCC) President and former Minister D K Shivakumar has demanded resignation of Minister In-Charge of COVID-19 for his alleged irresponsible comment, despite holding a responsible post.

Mr Shivakumar's comments came after Dr Sudhakar on Sunday shared a picture of him and his children in a swimming pool, on Twitter with a caption, ''After a long time joined my children for swimming hope maintaining social distance here as well…hahaha.''

However, Dr Sudhakar deleted the tweet from his account, soon after he was criticised for sharing such a picture, when the country is facing a health crisis.

Mangaluru, Jan 23: Bajpe Police on Thursday registered yet another case against the prime accused in Mangaluru International Airport case, Aditya Rao.

According to the police, a complaint was received from the officials of Indigo flight that they had to delay their flight scheduled to take off for Hyderabad at 1615 hrs after receiving a hoax call from Aditya, threatening of bomb.

They also asserted that the passengers were de-boarded from the flight and the luggages were brought back to security check again.