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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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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, Jun 5: The Karnataka government has asked all its departments and authorities to avoid during all official transactions the nomenclature "Dalit" for members belonging to the Scheduled Castes.

"All the departments and authorities of government of Karnataka are requested that (use of name Dalit) for all official transactions, matters, dealings, certificates, among others," the official circular said.

The Constitutional term Scheduled Caste in English and its appropriate translation in other national languages should alone be used for denoting the persons belonging to the Scheduled Castes/ Scheduled Tribes notified in the presidential orders issued under Article 341 of the Constitution, the circular said.

The circular issued on May 20 notes instructions issued by the Central government in 2018, with reference to the order of the High Court of Madhya Pradesh, Gwalior Bench.

"That the Central government/state government and its functionaries would refrain from using the nomenclature "Dalit" for the members belonging to Scheduled Castes and Scheduled Tribes as the same does not find mentioned in the Constitution or any statute," the order had said.

Pointing out that the Central government had earlier issued instructions that the words "Harijan" and "Girijan" should not be used, the circular said accordingly the Karnataka government also had issued a Government Order in 2010.

Bengaluru, Apr 15: With the reporting of the death of an 80-yr-old female from Hirebagewadi taluk in Belagavi district, the number of persons, who were died due to COVID-19 related disease, increased to 12, in Karnataka on Wednesday.

According to official sources, the deceased was a relative of another COVID-19 infected person, was succumbed to death this morning at a designated Hospital in Belagavi district.