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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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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, Mar 15: The Karnataka government on Saturday said it would advice IT companies to allow employees to work from home as most coronavirus  affected patients or their relatives were from this sector.

"If anybody (IT companies) asks (employees to work in the office),I will speak to them through the deputy chief minister so that they take steps to issue a definite order. We have very clearly said, Stay Home, stay safe," medical education minister Dr K Sudhakar said. He recalled that the chief minister himself had issued a strict advisory to allow employees work from home.

The minister said the IT sector understands the gravity of the situation because they are educated, have travelled abroad and have more exposure to information world. "No action," he said to a question on what action would be taken against companies who do not follow the instructions.

"There is no action to be taken. We have not promulgated any law. It should be a kind of a cohesive approach from the government and the responsible citizen," he said.

The minister said he had also acted on the advice of Infosys Foundation chairperson Sudha Murty, who had told him that all areas where public and students gather, including malls, theatres, schools and colleges, should be closed.

Sudhakar claimed that the woman whose husband had tested positive for cornavirus here, had flown straight to Delhi from the city and had not come out of Bengaluru airport. He said the newly-wed couple came to Bengaluru airport on March 8 night and early on March 9, she flew alone to Delhi. From there she travelled to Agra by train. She did not come out of the airport, said the minister.

To a question on legal action being contemplated against her, the minister said he would take a call said he was not thinking of legal action at present and would take a call only after the woman, who has also tested positive for the virus, comes out of isolation. He insisted that the purpose of getting details was not to scare people.

On the preparedness in Kalaburagi, where the first Coronavirus death in India was reported, he said the administration had 'clamped down" the entire district. Meanwhile, the deputy commissioner of Ballari district ordered cancellation of tourists' entry to the world heritage site of Hampi from March 15 to 22 to prevent further spread of the virus.