Vishweshwar Bhat begins new innings as Editor of Kannada Prabha

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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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 , Mar 21: Karnataka Congress President DK Shivakumar exuded confidence that the party will return to power in the state and praised former chief minister Siddaramaiah's term.

"I am confident that we will come back to power. Everyone in the past has worked their best to build the party. Siddaramaiah being a full-term chief minister gave the best programs to Karnataka, his government's programs were the best of all time," Shivakumar said at a press conference on Friday.

He further assured his full support to anyone who wanted to work for the betterment of the party.

"Though I have become the state president of the party but I am still the worker of Congress and each of us should work for the party as ground workers. I am ready to give any kind of support to those who want to work for the party. We need to take all caste, communities along for the betterment of the party," he said.

Shivakumar was appointed the state Congress President on March 11, while Eshwar Khandre, Satish Jarkiholi, and Saleem Ahmed have been appointed working presidents of Karnataka Pradesh Congress Committee.