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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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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 6: Karnataka registered 378 Covid-19 cases in the past 24 hours, breaching the 5,000-mark to settle at 5,213, said an official, here on Saturday. "New cases reported from Friday 5 p.m. to Saturday 6 p.m. is 378," said a health official.

Of the new cases, 333 are local returnees, comprising 88 per cent of the new infections. Returnees from Maharashtra accounted for 99 per cent new cases at 329.

Majority infections in Karnataka nowadays are returnees, mostly from the state''s northern neighbour. Only 27 new infections were contacts of earlier cases.

On Saturday, cases spiked in Udupi, Kalaburagi, Yadgir, Bengaluru Urban, Belagavi, Vijayapura, Davangere and Dakshina Kannada.

Udupi witnessed the highest number of cases (121), followed by Yadgir (103), Kalaburagi (69), Dakshina Kannada (24), Bengaluru Urban (18), Vijayapura and Davangere (6 each), Belagavi (5), Gadag (4), Mandya, Hassan, Dharwad and Haveri (3 each), Raichur, Chikkaballapura and Uttara Kannada (2 each) and Bidar, Tumkur, Kolar and Koppal (1 each).

Among the new cases, three patients from Bengaluru Urban are suffering from Influenza Like Illness (ILI) and another from Severe Acute Respiratory Infection (SARI).

There were seven cases with international travel history to United Arab Emirates (UAE) and one to Turkey.

Meanwhile, 280 people were discharged in the past 24 hours and two persons succumbed to the virus, one from Bidar and another from Vijayapura. Of all the cases, 3,184 are active, 1,968 discharged, 59 dead and 11 in the ICU.

In the past 24 hours, Karnataka tested 11,862 people, of which 11,431 reports returned negative. In total, 3.72 lakh samples have been tested so far, of which 3.61 lakh have returned negative.

Currently, Udupi is leading the state''s Covid-19 burden with 785 active cases, followed by Kalaburagi (448), Yadgir (407), Raichur (320) and Mandya (163) among others.

Bengaluru Urban has accounted for 13 deaths, followed by Kalaburagi (7), Bidar, Vijayapura, Davangere and Dakshina Kannada (6 each) and Chikkaballapura (3 each), among others.

Udupli, Jun 10: A promising Kabaddi player and young businessman allegedly committed suicide inside his father’s boat today at Malpe fishing port as he had suffered heavy loss in business due to covid lockdown. 

The deceased has been identified as Bhagyaraj (27), a resident of Pavanjigudde in Badanidiyoor, Bailakere. He was working as writer for two boats owned by his father. He was a well-known Kabaddi player in Udupi district. 

It is said that he had raised a huge loan to build a house and also acquired a fishing boat. However, he suffered heavy losses in business due to lockdown. Fish famine added to his woes. 

Upset by these developments, Bhagyaraj hanged himself inside his boat that was anchored at the port. A case was registered at Malpe police station. Investigations are on.