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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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

Belagavi, Mar 7: Karnataka Urban Development Minister B A Basavaraj on Saturday said that government would a take decision very soon regarding conducting city corporations election in the state.

Speaking with the media after review meeting at Belagavi city corporation (BCC) here he further said that delimitation exercise of the wards has to be done followed by reservations.

The minister stated that discussions would be held with Chief Minister B S Yediyurappa and would arrive at a decision to conduct the election in about a month’s time.

Karwar, June 29: The additional sessions court, Sirsi town police station and office of the deputy superintendent of police in Uttara Kannada district were sealed on Sunday after an undertrial was found positive for Covid-19.

The undertrial, accused of stealing a bike, from Hubballi was arrested by Sirsi police and had initially tested negative. He was confirmed infected when his samples were tested the second time.

He was arrested by Dharwad police in connection with a bike theft case. During interrogation it was found that he had stolen bikes in Sirsi too. Sirsi police had brought him from Dharwad sub-jail for the interrogation and was produced in the court.

The accused was in Manipal jail for some time after he was convicted there for the bike theft. While bringing him to Sirsi the police had wore PPE kits.

When he was produced in the court the judge had reportedly directed the police test him for covid as he had some symptoms.

His swab was collected and sent to the lab. In the first test the result was negative but it was positive in another test. At that time he was in Sirsi sub-jail. 10 police officials who had come into his contact have been quarantined. The police station has been sealed down and the court will be closed down on Monday and Tuesday.

All the under trails who were kept with him in the sub-jail have been isolated and their swab has been sent for the testing.