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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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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, May 8: Karnataka Minister for Primary and Secondary Education S Suresh Kumar on Friday said that the next academic year will have to be shortened as it will delayed due to the COVID-19.

Mr Kumar in a meeting with Education Department officials said that the syllabus and curriculum for the academic year will have to be designed according to time available. Additional content in the syllabus will have to be removed, according to a statement issued here by the education department here on Friday.

The Minister also stated that plans are underway to conduct CET examination meant for admission into professional courses immediately after the SSLC examination.

He also advised the officials to make the Department’s YouTube channel feature more subject-wise and chapter-wise content for the aid of the students.

Additionally, a booklet will be launched to teach students on how to adjust to life in the post-COVID-19 world.

Bengaluru, Jan 10: The Special Investigation Team (SIT), probing the murder case of journalist-activist Gauri, arrested absconding suspect Rushikesh Devdikar alias Murali (44) from Dhanbad district in Jharkhand on Thursday evening and is bringing him to the city.

Rushikesh is the 18th suspect arrested in the case, Chief Investigating Officer M N Anucheth said. The investigation has revealed that he was primarily involved in the conspiracy to murder Gauri.

Rushikesh, who was hiding in a house in Katras, Dhanbad, will be produced before the local Judicial Magistrate in Dhanbad on Friday, said Anucheth, adding that the SIT had searched his house for clues. "We will obtain a transit warrant from the court and then bring him to Bengaluru," the officer said.

Originally from Aurangabad in Maharashtra, Rushikesh's family still lives there.

Gauri Lankesh was shot dead near her residence at around 8.20 pm on September 5, 2017, by two bike-borne men.