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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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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 6: Karnataka Chief Minister BS Yediyurappa on Wednesday urged migrant workers to stay back as construction activities have resumed and also announced a Rs 1,610 crores COVID-19 financial package for the state.

The Chief Minister also said that close to one lakh persons, including migrant workers and students, among others, have so far been sent back to their home towns from Karnataka.

"We have sent around one lakh people in 3,500 buses and trains, back to their home towns. I have also appealed to migrant workers to stay as the construction work has resumed now," the Chief Minister said at a press conference on Wednesday.

"A package of Rs 1,610 crores will be released as COVID-19 financial relief. One time compensation of Rs 5,000 will be given to 2,30,000 barbers and 7,75,000 drivers," he added.

During the course of the press conference, the Chief Minister also announced compensation for floriculturists in the state.

Bengaluru, May 1: Karnataka government has assigned State Nodal Officers after the Ministry of Home Affairs (MHA) order regarding the inter-state movement of stranded migrant workers, tourists, pilgrims and students during the lockdown period.

The Nodal officers have also been appointed for coordination with 11 different states.

In an order issued on Thursday, Karnataka Government wrote, "To facilitate smooth and orderly movement of persons across State borders as per SOPs, the undersigned, in the exercise of powers conferred under the Disaster Management Act, 2005, and in the capacity as Chairman, State Executive Committee, hereby appoint the following officers as Nodal officers to coordinate with Nodal Officers of States/Union Territories (UTs) mentioned against their names."

Dr Rajkumar Khatri, IAS and Arun Jeji Chakravarthy, IPS will be overall in charge of the movement of stranded people from outside States/UTs to Karnataka.

N Manjunatha Prasad, IAS and P S Sandhu, IPS will be overall in charge of the movement of stranded people from Karnataka to other States/UTs.