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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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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, May 17: Karnataka on Sunday extended lockdown for two days until midnight of Tuesday, May 19. Earlier today, Tamil Nadu and Maharashtra extended the lockdown till May 31. The state government said that the guidelines and norms as followed during Coronavirus Lockdown 3 will remain in place till 19th midnight or till further notice.

Meanwhile, the total number of coronavirus cases in Karnataka rose to 1,146 on Saturday. With 37 deaths and 497 discharges, there are 611 active corona cases in the state. 

Out of 54 new cases, twentytwo are from Mandya, ten from Kalaburagi, six from Hassan, four from Dharwad, three each from Yadgir and Kolar, two each from Dakshina Kannada and Shivamogga, and one each from Udupi and Vijayapura.

Bengaluru, Apr 15: With the reporting of the death of an 80-yr-old female from Hirebagewadi taluk in Belagavi district, the number of persons, who were died due to COVID-19 related disease, increased to 12, in Karnataka on Wednesday.

According to official sources, the deceased was a relative of another COVID-19 infected person, was succumbed to death this morning at a designated Hospital in Belagavi district.