Rebellion explodes in Congress over ticket denial to 12 sitting MLAs

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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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 5: Karnataka Home Minister Basavaraj Bommai on Tuesday said that he has demanded a report on the Shaheen School incident after reports emerged that children were allegedly interrogated by the police for hours at a stretch, while not allowing parents to be present.

Terming the incident a very sensitive matter as it involves children, Basavaraj Bommai said, "I have asked for a report on the Shaheen School incident. As it is a very sensitive and serious issue, I have asked the police to handle it carefully."

"I have asked the police to take the help of the women and child protection committee at the district level. However, I have been told that the police had visited the area where the play was done and no interrogation of children in isolation took place. Nevertheless, I have asked the police to handle the issue with care and do everything within the law," Basavaraj added.

The matter pertains to a programme organised as a part of the Republic day celebrations where the children in Shaheen School in Bidar had staged a play against the Citizenship Amendment Act (CAA) and National Register of Citizens (NRC).

The Akhil Bharatiya Vidyarthi Parishad (ABVP) had protested alleging that the play at Shaheen School in Bidar was derogatory. In the play, the participants were shown staging an anti-CAA sequence where there were dialogues encouraging non-cooperation with anyone asking for documents. A case was registered against the school management.

Meanwhile, CEO of Shaheen Education Institute, Bidar, Tauseef Madikeri had said, "Police have invoked Sections 124A, 505 and 504 of the IPC against the institution, over a play staged against CAA and NRC. It is beyond anyone's imagination. Deputy SP visited the classroom and interrogated the students."

Karnataka police had sealed the offices of the school after its students participated in the play. Meanwhile, the police had questioned students of Shaheen School after a play against the CAA and NRC was staged during the Republic Day celebrations.

The child rights groups, teachers and educationists had issued a statement condemning the police interrogation in the incident.