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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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

Udupi, Mar 6: District Health Officer Sudheer Chandra said that health department had compiled a list of foreigners visiting the Temple town Udupi and ensure that they are not infected with Coronavirus.

Addressing media persons at District Government Hospital in Ajjarkad on Friday, he said the Isolation Unit set up with five beds to treat the new Coronavirus infection includes two beds with Ventilator facility. Isolation wards with three beds were set up in Kundapur and Karkala taluks to treat the affected.

In order to prevent the spread of Coronavirus, Committees were formed at District and Taluk level, he added.

Bengaluru, Jun 8: Karnataka recorded 308 new COVID-19 cases in the past 24 hours, with the majority of patients being domestic returnees, raising the state's tally to 5,760 an official said, here on Monday. "Over 308 new cases were reported from Sunday 5 pm to Monday 5 pm," said the health official.

Like everyday Maharashtra returnees accounted for 96 per cent (267 cases) of the 277 new cases. Majority infections in Karnataka nowadays are returnees, mostly from the state's northern neighbour.

A few returnees also came from Tamil Nadu, Telangana and Andhra Pradesh. There was one international returnee, a 23-year-old man from Dakshina Kannada, who came from the UAE. Only 24 new infections were contacts of earlier cases.

On Monday, cases spiked in Kalaburagi, Yadgir, Bidar, Udupi, Bengaluru Urban, Ballari and Gadag.

Among the new cases, Kalaburagi contributed (99), followed by Yadgir (66), Bidar (48), Udupi (45), Bengaluru Urban (18), Ballari (8), Gadag (6), Shivamogga and Dharwad (4 each), Hassan and Dakshina Kannada (3 each), Bagalkote (2) and Koppal and Ramnagar (1 each). Four patients are suffering from Influenza-Like Illness (ILI).

Meanwhile, record 387 patients got discharged in the past 24 hours. On Monday, three persons - A 67-year-old man, a 48-year-old woman and another 65-year-old woman, all from Bengaluru Urban, succumbed to coronavirus.

Of all the cases, 3,175 are active, 2,519 discharged, 64 dead and 14 in the ICU.

In the past 24 hours, Karnataka tested 8,779 people. Of this, 8,231 reports returned negative. A number of tests were lower than other days. In total, 3.93 lac samples have been tested so far, of which 3.8 lac have returned negative.

Currently, Udupi is leading the state's COVID-19 burden with 628 active cases, followed by Kalaburagi (539), Yadgir (488), Raichur (276) and Bengaluru Urban (176) among others.

Bengaluru Urban has accounted for 18 deaths, followed by Kalaburagi (7), Bidar, Vijayapura, Davangere and Dakshina Kannada (6 each) and Chikkaballapur (3 each), among others.