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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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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, Apr 25: Karnataka Health Minister B Sriramulu on Saturday initiated Phase I clinical trials to use plasma therapy for COVID-19 patients at city-based BMC Victoria Hospital.

Sriramulu was accompanied by Medical Education Minister Dr K Sudhakar.

"Karnataka has taken a lead role as we initiate Phase I clinical trials to use Convalescent Plasma Therapy for severe COVID-19 infected patients. BMC Victoria hospital took the first step today. We are determined to vanquish this enemy of mankind," Sriramulu said in a tweet.

"I wish our team of doctors at BMC Victoria hospital and team led by Dr US Vishal Rao a great success. This will be a torchbearer in our fight against Corona," he said in another tweet.

According to the Ministry of Health and Family Welfare, the state has so far reported 474 confirmed cases of COVID-19 which include 152 discharged or cured patients and 18 deaths.

Ballari, Mar 6: Ballari Deputy Commissioner S S Nakul on Friday said that two persons who had shown symptoms of COVID-19 had been admitted to the district government hospital here.

Informing this to the presspersons here, Mr Nakul said that the cases were reported from Jindal village of K R Hospital taluk and another one from Hospet town in Ballari taluk.

He said a suspect returned from Dubai to Hospet last week and showed symptoms of COVID-19. Both suspected patients were admitted to special isolated ward in Ballari government hospital and their throat swab tests taken on Thursday had been sent to lab in Bangalore to check for COVID-19.