Transit One: Well begun is half done

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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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 12: Karnataka on Thursday confirmed another positive case of the deadly coronavirus, taking the total number of infected persons to five in the state.

According to a source from the State Health Department, the infected person, a 26-year-old patient had recently returned from Greece. He is currently under observation in an isolation ward in a city hospital.

Bengaluru, Jun 4: Karnataka opposition leader Siddaramaiah created a flutter on Wednesday saying many disgruntled BJP leaders had met him.

"Many disgruntled BJP lawmakers have met me and, of course, expressed their displeasure," tweeted Siddaramaiah.

Congress leader Siddaramaiah''s statements assume significance as recently several reports emerged highlighting some north Karnataka legislators meeting over dinner to put pressure on Chief Minister B.S. Yediyurappa to expand the cabinet and offer them ministerial roles.

North Karnataka leaders such as Umesh V. Katti, Chitradurga MLA G. H. Thippareddy and Vijayapura MLA Basanagouda Patil Yatnal and others met over dinner.

However, the Chief Minister said he was too busy to even look at the dissidence because he is occupied with development work of the state and fighting Covid.

Siddaramaiah, the former chief minister, alleged that Yediyurappa''s son Vijayendra is functioning as a non-constitutional chief minister.

"This is true in the BJP. That dissent will continue. We are not responsible if the government collapses," he pointed out.

The Congress leader said Karnataka has stooped to the level of not being in a position to even pay salaries to its employees.

"The state was the first in economic discipline during our government. Now the government has no money to pay salaries to government employees. Not only the state but the entire country is financially bankrupt," he said.