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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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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,  Jul 22: Karnataka Congress president DK Shivakumar on Tuesday said that the state government should give details of the amount it spent on migrants and labourers during the coronavirus crisis if it is transparent.

"The image of Karnataka has come to a very rotten position. We all know that Karnataka has failed in sorting out the problem. Let them (the state government) tell what has been the amount spent on the labour, migrants, food kits on the health department. We want an account (of the expenditure) if they are so transparent," Shivakumar said.

He said that the state government should have approached the hospitals for treating COVID-19 patients and if any hospital refused, a message should have been given that the government would take it over.

He also accused the state government of corruption.

Kochi, Mar 30: Kerala High Court, while hearing a petition filed against Karnataka's decision to block the border with Kerala, on Monday said that no lives should not be lost in the name of fighting coronavirus.

Kerala High Court also said that "the current problem should be resolved amicably. Both the Union government and the Karnataka government should rise to the occasion."
The Central government has informed Kerala High Court that the movement of goods and medical services qualify under essential services, which is permitted despite the lockdown, and added that directions have been issued to give priority to the movement of such goods and services.
Meanwhile, the Karnataka government has sought a day's time to clarify their stand.

The matter will be taken up for further hearing via video conference tomorrow.
Kerala government has submitted that the action of Karnataka government to close the border is illegal as all the national highways in the country come under the jurisdiction of the National Highway Authority.

Meanwhile, Congress MP Rajmohan Unnithan has also approached the Supreme Court seeking directions to open the Karnataka-Kerala border to allow movement of ambulances and other emergency vehicles for the transport of essential items to Kerala.