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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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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, Jul 8: Karnataka has drafted 1,246 government employees into the crucial task of contact tracing to fight the coronavirus pandemic, and they have been warned of action if they refuse to work.

These are Group A, B and C employees from various departments who have been asked to report to senior IAS officer V Manjula, who heads a task force on Covid-19 contact tracing.

In an order, Chief Secretary TM Vijay Bhaskar on Tuesday said additional human resources were required to strengthen contact tracing, which is “a very important part” of controlling the spread of Covid-19.

Bengaluru, Jul 17: Lashing out at Chief Minister BS Yediyurappa-led government over the handling of coronavirus crisis, Karnataka Congress chief DK Shivakumar on Thursday demanded Governor's rule in the state. He also took a dig at Health Minister B Sriramulu's "Only God can save us" remark.

"I heard the statement of Sriramulu and Sudhakar. They have said that they cannot manage this (coronavirus crisis) and they leave it to God who can save Karnataka. If such is the case, they could not solve the problems of the people of Karnataka. It is time now they must resign and let the Governor's rule come into force. The time has come for all of them to step down," Shivakumar said.

Taking to Twitter, Sriramulu said that the KPCC president misinterpreted his statement.

He said that Opposition allegations of negligence and incapability of the government and irresponsibility of ministers are "far from the truth".

The minister said that people should be made aware of the prevention of coronavirus as it plays a very important role in the prevention of infection.

"Here are the cautioning words, 'If you stumble, only God has to save us.' The government, our Chief Minister BS Yediyurappa and ministers are working day and night. We are working for the people, to effectively face this century's challenge," he tweeted.

As many as 4,169 new COVID-19 cases and 104 deaths were reported in Karnataka on Thursday, taking the total number of cases to 51,422 cases including 19,729 recoveries and 1,032 deaths.

Bengaluru reported 2,344 new cases and 70 deaths in the last 24 hours, according to the state health department.