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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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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 12: The Karnataka government is mulling to issue caste and income certificates to Brahmins though they are in a minority, accounting a mere three per cent of the southern state''s seven crore population, an official said on Thursday.

"Though Brahmins are in a ''minority'' in terms of their population across the state, they need caste and income certificates to benefit from the welfare schemes as in the case of the SC, ST and OBC groups," an official said here.

The Karnataka State Brahmin Development Board was set up in March 2019 as a state-run company with Rs five crore authorized capital and Rs five crore equity and is registered with the Registrar of Companies.

"The Board has petitioned the state government to implement the 10 per cent quota for the economically weaker sections, as its benefit is being given by the central government jobs and in admissions to the national educational institutions," said its chairman H.S. Sachidananda Murthy.

Responding to the demand, state Chief Minister B.S. Yediyurappa said the state government would consider issuing caste certificates to the Brahmins so that they too can benefit from the state''s various welfare schemes.

"Though Brahmins belong to the forward community, they are economically weaker and need financial support," said Yediyurappa on Wednesday after unveiling the Board''s official website for all its stakeholders here.

Brahmins whose gross annual family income is less than Rs eight lakh per annum will be eligible for the benefit schemes.

"The Board will soon be authorised to issue caste and income certificates to the members of the Brahmin community so that they can also benefit from the schemes," said the chief minister on the occasion.

Noting that every community has people who are forward and backward economically for various, including historical reasons, Yediyurappa said the Board would be empowered to serve the Brahmins.

"The Board also proposes to provide interest-free loans to the financially weaker sections of the people in the Brahmin community," added Murthy.

The community members urged the Chief Minister to provide 10 per cent of the state government jobs and seats in state-run educational institutions, including professional collages.