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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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

Mangaluru, Apr 23: An elderly woman who was tested positive for COVID-19 in Dakshina Kannada district today breathed her last.

The deceased is a 77-year-old woman from Bantwal taluk. 

She is said to be a close relative of the Bantwal woman who died of COVID-19 on April 19.

She was shifted to govt Wenlock Hospital which is now converted into COVID-19 hospital on April 22 from a private hospital.

Her throat swabs were sent for testing. Health and family welfare department earlier today confirmed that she was tested positive for coronavirus.

Within hours she breathed her last without responding to any treatment. 

So far 17 corona positive cases have been confirmed in the district including two deaths. Most of them have returned home after recovering.

Bengaluru, Mar 7: Karnataka on Friday announced that there are no positive cases of the novel coronavirus, COVID-19 in the state till date.

"To date, 717 persons have been identified for observation, of them, 236 persons have completed 28 days of observation and 469 persons are continuing under home quarantine. 8 persons are admitted to selected isolation hospitals, " the state government said in a release today.

"Around 343 samples of symptomatic persons are sent for testing and 296 samples are reported as negative. No positive cases of Coronavirus in the state to date," it said.

Karnataka Chief Minister BS Yediyurappa earlier in the week assured people in state about the preparedness to tackle coronavirus.

He said, "We have issued instructions to all hospitals. We have made all the arrangements. People in Karnataka should not worry."

Union Health Minister Harsh Vardhan earlier today held a review meeting with states over preparedness for coronavirus. State governments have been asked to keep the testing and quarantine facilities, isolation wards and labs in active readiness.

The country's total number of positive cases of coronavirus touched 31 today. COVID-19 has so far killed more than 3200 people globally.