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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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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 27: Union Minister of State for External Affairs V Muraleedharan on Wednesday said the Union Government will take up the issue of establishing a US consulate in Bengaluru during bilateral talks with the US officials in the future.

Speaking at a seminar on Videsh Sampark here, Mr Muraleedharan said after Delhi and Mumbai, a large number of visa applications come from Bengaluru. “We will take up the issue of establishing a US consulate in Bengaluru during bilateral talks,” he said.

Earlier, the chief secretary of Karnataka TM Vijay Bhaskar urged the centre to consider the state government’s demand of setting up a US Consulate in Bengaluru. At the moment visa applicants have to travel to Chennai for the purpose.

Bengaluru, Mar 6: All the arrested in a case of sedition filed over a school play in Karnataka's Bidar have been granted anticipatory bail by a court that said the case lacked enough basis.

The play, themed on protests against the Citizenship (Amendment) Act (CAA), "has not caused any disharmony in the society", said the district and sessions court in Bidar.

The play, performed in January by the children of prestigious Shaheen School, landed in trouble when a sedition complaint was filed over an 11-year-old girl's lines - enacting an elderly woman, she said if anyone asked for documents she would hit them with slippers.

That led to a sedition case and the police questioning children, teachers and the school management over many rounds.

"The drama has not caused any disharmony in the society. Considering all the circumstances, I am of the opinion that the ingredients of Section 124A of IPC (Sedition) are prima facie lacking," said the court.

Five members of the school management team have been granted protection from arrest. Earlier, the head teacher and the mother of the student who spoke the dialogue were sent to custody, but on other charges including the abetment of an offence. They were not accused of sedition. They were later granted bail.

The repeated questioning of young students and the arrest of the widowed mother of a student caused a huge uproar in the town.

An order is expected soon on the bail application in another sedition case in Karnataka, against three Kashmiri students. The students, who were studying in Hubbali in north Karnataka, are facing charges for reportedly using pro-Pakistani slogans in an online post. The Hubbali Bar Association had asked its members not to represent the students. Lawyers from Bengaluru who went to Hubbali represent the students were heckled.

On Thursday, a team of lawyers from different districts again went to Hubballi and were provided police protection. BT Venkatesh, one of the lawyers, said he had a meeting with bar association members and that the matter was sorted out. The students have applied for bail and an order is expected next week.