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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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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

Udupi, May 17: A total of 1,460 migrant labourers left for Uttar Pradesh from Indrali Railway Station in Udupi in Shramik Special train on Sunday.

This is the first train to ferry migrant labourers from Udupi. As many as 236 from Karkala, 323 from Kundapura, 901 labourers from Brahmavar, Kaup and Udupi left for their native villages.

More than 2,000 labourers had gathered at the railway station and only 1,460 labourers received tickets to travel.

Those who did not receive tickets were disappointed and got into heated arguments with the officials.

The labourers were promised that they will receive tickets to another train, that would depart from Udupi before May 20. One bogie of the train was reserved for pregnant women, women and children.

As many as 1,712 from Jharkhand, 770 from Odisha, 977 from West Bengal, 1,600 from Bihar, 379 from Madhya Pradesh, 280 from Chattisgarh, 110 from Uttarkhand, 379 from Rajasthan had registered on Seva Sindhu portal.

Additional Deputy Commissioner B Sadashiva Prabhu said that there are plans to make arrangements to send migrant labourers from UP, Uttaranchal, Madhya Pradesh and Jharkhand.

Mangaluru, May 13: Kannadigas in the United Arab Emirates (UAE) have sought additional flights to return to Karnataka during a video conference with Chief Minister B S Yediyurappa here on Tuesday.

Noting that most of the ex-pats in UAE were from the coastal region, they urged the state government to ensure that most of these flights land in the Mangalore International Airport.

Many Kannadigas in the UAE were left unemployed due to the lockdown. “Many of them do not have the means to return to Karnataka and the state government should aid them,” representatives of various Kannadiga ex-pat groups urged the CM.

Yediyurappa said that the government has made all arrangements to bring back the ex-pats, and assured to fulfil all their demands.