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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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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, Feb 4: Taking the state government to task, the Karnataka High Court on Monday opined there was a need to rehabilitate or compensate migrant workers whose homes in Tubarahalli and Kundalahalli were demolished by a BBMP engineer last month.

On January 19, the Bruhat Bengaluru Mahanagara Palike (BBMP) assistant executive engineer at Marathahalli had taken up a demolition drive stating that the migrant workers residing in the area were “illegal Bangladeshis”.

A division bench led by Chief Justice Abhay S Oka was hearing a petition by the People’s Union for Civil Liberties which contended that the evacuation of the workers was illegal. Stressing the need for relief, the court directed the state government to come clean on its stance and adjourned the hearing to February 10.

Advocate General Prabhuling K Navadgi submitted that the Union government had issued a circular last year to ascertain the presence of illegal Bangaladesh migrants. “On the basis of this circular, the BBMP officials had written a letter to Marathahalli police sub-inspector on January 18. Based on this letter, the residents in huts were evicted in a civilised manner,” he stated.

The bench, however, differed with the submission. “Who identified them as Bangladeshis before the eviction? Which is the competent authority to do so? Which police officer took up the inquiry?” the bench questioned.

The court also asked whether the government would take up similar eviction drives against illegal buildings of the rich. It also expressed displeasure over the action taken against the BBMP engineer.

“Instead of sending him home, you say you have transferred him. We can’t be mute spectators,” the bench said.

The court did not mince words as it castigated the authorities for failing to act judiciously. “The police and the BBMP are blaming each other. Your action appears to be dangerous. Going by the state of things, it seems that everything is not in order,” it said.

Mangaluru, June 23: G Jagadeesha, deputy commissioner of Udupi, who is heading the magisterial inquiry into the December 19 police firing case in Mangaluru, has sought more time from the government to submit the report.

Two innocent passersby - Nauseen Kudroli (49) and Abdul Jaleel Bengre (23) - were killed when policemen opened fire randomly after caning the alleged anti-CAA protesters in Mangaluru. 

The chief minister B S Yediyurappa led Karnataka state government had commissioned two inquires, one magisterial and the other CID, into the incident. 

“Due to the covid-19 pandemic the probe couldn’t be complete on time. I have asked the government for more time. Two more hearings are to be conducted,” said Mr Jagadeesha, who was expected to submit the report before the government on Tuesday.