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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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

Bagalkot, April 4: A COVID-19 positive patient passed away in Karnataka's Bagalkot on Friday, taking the total number of deaths in the state to four, informed the Deputy Commissioner of Bagalkot.

The total number of coronavirus cases in the country now stands at 2650 including 184 people who have been discharged or cured or migrated, and 68 deaths, as per the data provided by the Ministry of Health and Family Welfare.

Dubai, Feb 19: A 25-year-old Indian engineer allegedly fell to his death from a residential apartment in Dubai, according to a media report.

Sabeel Rahman, from Kerala who has been living in Dubai since 2018, fell off the building near his work site, The Khaleej Times quoted a social worker as saying.

Naseer Vatanapally, the social worker, is assisting the family to repatriate his mortal remains back home to Thirur in Malappuram district, the report said.

"The case is a bit unusual. We''re not sure why he went to the building near his worksite," said Naseer Vatanapally.

"His family is unaware of any issues he may have faced. He had asked his brother to collect a new mobile phone he had purchased online - which they received. He had no reason to take his life," he added.

Rahman was the youngest of four siblings. The devastated family is awaiting details from the Rashidiya Police Station. "Following legal procedures, we will repatriate his body back home," he said.