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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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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, Jun 14: Karnataka Medical Education Minister K Sudhakar on Sunday said there was no question of reimposition of the lockdown amid speculation that it would be done.

"The question of lockdown is not in front of us. There is such speculation as the Prime Minister is holding a video conference with all Chief Ministers on June 16 and 17.

On June 17 our state will be taking part in it at around 3 pm," Mr Sudhakar said in response to a question.

Speaking to reporters at Kalaburagi, he said the current situation would be discussed in that meeting. Mr Sudhakar said the Prime Minister has repeatedly been holding such video conferencing exercises to take stock of the situation and plan for the future.

"There will not be a lockdown anymore according to me," he added.

There has been speculation that there would be another shutdown from this month owing to a rapid rise in the number of cases.

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Mr Sudhakar had on Friday said experts have indicated a surge in COVID-19 cases in the state in August and that the government was taking all precautionary measures in that direction.

As of June 13 evening, cumulatively 6,824 COVID-19 positive cases have been confirmed in the state, which includes 81 deaths and 3,648 discharges.

Bengaluru, Jun 12: Karnataka on Friday reported 464 discharges, its highest, as the state confirmed 271 new cases of COVID-19 and seven related fatalities, taking the total number of infections to 6,516 and the death toll to 79.

In a significant development, the day also saw the total number of discharges overtaking the number of active cases in the state.

As of June 12 evening, cumulatively 6,516 COVID-19 positive cases have been confirmed in the state, which includes 79 deaths and 3,440 discharges, the Health department said in its bulletin.

It said, out of 2,995 active cases, 2,976 patients are in isolation at designated hospitals and are stable, while 19 are in ICU.

The seven deaths include four from Bengaluru, two from Kalaburagi and one from Hassan.

Those from Bengaluru are three women aged 61, 65 and 49 and a 52-year old man.

Among the dead from Kalaburagi are two men aged 53 and 48 while a 60-year old man from Hassan also succumbed to the virus.

Out of 271 new cases, 92 are returnees from other states, majority of them from neighbouring Maharashtra.

While 14 are those who returned from other countries.

Among the districts where the new cases were reported, Ballari accounted for 97 cases, followed by Bengaluru urban 36, Udupi 22, Kalaburagi 20, Dharwad 19, Dakshina Kannada 17, Bidar 10, nine each from Hassan and Mysuru, Tumakuru 7, Shivamogga 6, four each from Raichur and Uttara Kannada, three each from Chitradurga and Ramanagara, Mandya 2, and one each from Belagavi, Vijayapura and Kolar.

Udupi district tops the list of positive cases, with a total of 991 infections, followed by Kalaburagi (816) and Yadgir (735).

Among discharges also Udupi tops the list with a total of 474, followed by Kalaburagi (345) and Bengaluru urban (299).

A total of 4,26,341 samples have been tested so far, with 9,835 on Friday alone.

So far 4,11,244 samples have been reported as negative, and out of them 9,139 were reported negative today.