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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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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, Jan 10: Demanding the setting up of a House Committee to probe the Mangaluru violence, former Chief Minister HD Kumaraswamy on Friday released multiple videos of the clashes that broke out during the anti-Citizenship Amendment Act protest that claimed two lives on December 19.

Janata Dal-Secular leader further demanded suspension of Police Commissioner PS Harsha and insisted that House Committee consisting of members of all the parties should be formed to probe into Mangaluru violence and said that magisterial inquiry ordered by the state government cannot be trusted.

"Constitute a House committee and produce the fact. The main culprit is the commissioner of Mangaluru, remove the officer as he is the main culprit. I am going to take this issue on the floor of the House." Kumaraswamy said during a press conference here.

Two people were killed in Mangaluru in the alleged police firing after protests against the Citizenship Amendment Act turned violent.

The Act grants Indian citizenship to refugees from Hindu, Christian, Sikh, Buddhist and Parsi communities fleeing religious persecution from Pakistan, Afghanistan, and Bangladesh who entered India on or before 31, 2014.

Bidar, Mar 4: The Principal District and Sessions Court in Bidar, on Tuesday, granted conditional bail to five functionaries of Shaheen School management — Abdul Qadeer, Allauddin Pasha, Mehtab Sait, Bilal Inamdar and Abdul Khaleq — who moved anticipatory bail in a sedition case slapped against their school recently.

Conditions

Senior advocate B.T. Venkatesh from Bengaluru argued for the petitioners. Managoli Premavati Mallikarjuna granted bail on certain conditions, including execution of personal bond of ₹2 lakh each.

The sedition case was filed against the Shaheen School management for its children staging a play as part of their annual day celebrations on January 21, in which a character had allegedly delivered a dialogue against Prime Minister Narendra Modi.

While Nazbunnisa, the mother of the child who had allegedly delivered the dialogue in the play, and Fareeda Begum, the headmistress of the school, were arrested, they were subsequently released on bail last month.