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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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

Mangaluru, Jan 23: Members of the Social Democratic Party of India (SDPI) on Thursday held a protest against the Karnataka government, accusing it of shielding Aditya Rao, the main accused of planting an improvised explosive device (IED) at the Mangaluru airport on January 20.

Meanwhile, the Judicial Magistrate First Class (JMFC) Court has sent the accused Aditya Rao to 10 days police custody.

Earlier on Wednesday, the Bengaluru Police said that the procedure is being followed to hand-over to the Mangaluru Police a suspect who surrendered before it two days after planting an improvised explosive device (IED) at the Mangaluru International Airport.

The IED was later defused in an open field by the personnel of the bomb disposal squad.

Bengaluru, Jun 28: Former Chief Minister and senior Congress leader Siddaramaiah asked the Karnataka government to release White Paper over the state of healthcare system and the government's preparedness to address COVID-19 pandemic.

He said that the State Government to come clean on the charges of misappropriation of large sums of funds in the name of fighting the COVID-19 pandemic in the state.

"People are extremely worried about the state of our healthcare system and the government's preparedness to address pandemic. It is the responsibility of Karnataka Chief Minister to clear the doubts and reduce the panic among people. I urge the government to #ReleaseWhitePaper about the same," the Congress leader tweeted.

Siddaramaiah said that the Chief Minister should let people know about the amount of money already spent to improve healthcare facilities, the number of beds and ventilators increased and about the supply of PPE kits to COVID-19 warriors.

"Karnataka Chief Minister should also reveal the contribution of PMO India to our state. Has Karnataka Chief Minister BS Yediyurappa demanded anything from Narendra Modi? How much of PM CARES Fund is spent for Karnataka's healthcare?" he asked in another tweet.

He went on to say that PMO India and Chief Minister of Karnataka "wasted crucial time during lockdown."

"The purpose of lockdown was to fill the gaps in health care system. But they just widened it by frequently changing the protocols and by not doing adequate tests," he said.

"Karnataka Chief Minister and other departments have failed to answer my multiple queries regarding the actions taken. As a leader of opposition, it is my right to question the government on behalf of people. Deliberate act of denying information is a breach of privilege. Government hospitals have reached its capacity and private hospitals are not ready to treat patients at capped prices," he wrote.

Siddaramaiah said that the Karnataka Chief Minister should either convince private players or take action against them, and added, "Not doing both is like pushing people off the cliff."

He tweeted, "The testing rates per day have come down in last 15 days even when the cases are rising. What is stopping the government from increasing the testing? The government is putting people at risk by not testing adequately."

Further attacking the state government, he wrote, "Our state needs 9000 ventilators, but we have only 1500, PMO India has sent 90 to us. Is this a joke to Karnataka Chief Minister and PMO India? #ReleaseWhitePaper about the ways that they plan to increase ventilators."