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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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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, Jul 8: In a setback to the State government, the Karnataka High Court on Wednesday stayed the initial ban and the subsequent restrictions imposed on schools against conducting online classes from pre-primary to Class X.

Prima facie the ban and embargo imposed on online education violate Articles 21 and 21A of the Constitutionon the fundamental right to education, the Court said.

A Division Bench comprising Chief Justice Abhay Shreeniwas Oka and Justice Nataraj Rangaswamy passed the interim order staying the operation of Government Orders issued on June 15 and June 27 respectively.

The Bench passed the interim order on the petitions filed by parents of children and several educational institutions questioning the legality of the ban and the restrictions imposed.

However, the Bench made it clear that this order should not be construed that the schools have right to make online education compulsory and can charge fee for offering online education. Also, the schools should not deprive students, who cannot opt for online education, the lost education when the schools reopen on regular basis.

Belagavi, Mar 10: Around 6,000 chickens were buried alive by some poultry farm owners here as the rate of flesh in the market dropped even below the cost price due to Coronavirus scare.

The poultry farm who buried the chickens on Monday evening belonged to Lolasuru village in Gokak Taluk of the district.

One of the owners, Nazir Makandar, said that there was no demand for chicken because of threat of Coronavirus.