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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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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, May 18: With the detection of 99 fresh cases of COVID-19, highest single-day spike, including 24 from Bengaluru Urban district, the total number of persons contracted for the disease in the state has surged to 1,246.

Apart from 24 fresh cases in Bengaluru Urban district, Mandya recorded 17 cases followed by Uttara Kannada (09), Raichur (06), Yadagiri (06), Gadaga (05), Kalaburagi (10), Hassan (04), Koppal (03), Vijayapura (05), Mysuru (01), Belagavi (02), Ballari (01), Udupi (01), Kodagu (01) and Koppal (03).

So far 37 persons had succumbed to the virus in the state.

Udupi, Jan 9: State Revenue Minister R Ashoka said on Wednesday that the state government is embarking on a novel method to ensure that social security schemes were available to the beneficiaries at their doorsteps.

Speaking after inaugurating the Mini Vidhana Soudha here, he said government will look into the Aadhaar number and income certificates to decide the eligibility of the beneficiaries. The initiative will help the poor to access welfare schemes without any hassles.

The initiative will be launched as a pilot project in Udupi district. Later, the project will extend to other districts in a phased manner. In Udupi district, 30,000 beneficiaries have been identified. The government has set aside nearly Rs 7,000 crore for social security schemes. The initiative will not only eliminate middlemen menace but will help the government save Rs 1,000 crore.