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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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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, Mar 11: Amid the prevailing political uncertainty in Madhya Pradesh with Jyotiraditya Scindia's exit, Congress leader DK Shivakumar on Wednesday asserted that "leaders may come and go but no one can destroy Congress."

"No one can destroy Congress. Leaders may come, leaders may go, that doesn't make any difference," said Shivakumar while speaking to news agency on the current political scenario for Congress in Madhya Pradesh.

Speaking about the Madhya Pradesh Congress MLAs, who are lodged in Bengaluru, he said: "All the Madhya Pradesh MLAs who are here do not want to lose their membership. I am sure they will understand, go back and save the government."

On Tuesday, Congress sent two of its leaders -- Sajjan Singh Verma and Govind Singh -- to Bengaluru in order to pacify some of the rebel MLAs who are lodged in a hotel there and who claimed to have resigned from the state Legislative Assembly.

After meeting with 19 party MLAs who have tendered their resignations, Congress leader Sajjan Singh Verma on Wednesday said they are neither willing to support Jyotiraditya Scindia nor in favour of joining BJP as they were "misled and taken to Bengaluru" in Karnataka.

"Nobody is ready to go with Scindia ji. They said they were misled and taken to Bengaluru, most of them said they are not ready to join BJP," Verma told ANI on being asked about the 19 MLAs.

"I just came from Bengaluru and now I am going to Jaipur. Besides 5-6 ministers and one MLA, we all are going to Jaipur. They (MLAs) have said they have the blood of Congress and they will remain in the party. Since Scindia was a senior party leader, all our MLAs followed his order as a courtesy," he said.

The Congress leader further claimed that BJP is using both "muscle and money power" to influence Congress MLAs.

He also claimed that he is strongly in contact with 7-8 BJP MLAs.

Most of the rebel MLAs are perceived close to Scindia and are apparently unhappy at Scindia being "ignored" in the party. The grand old party has been witnessing an internal turf war in Madhya Pradesh since the party formed the government in the state in 2018.

Scindia is likely to join BJP later today.

Bengaluru, April 6: The total number of positive cases in Karnataka climbed to 163 after 12 more cases were reported, state government officials said on Monday.

Out of the 12 new cases, three of them have a history of travelling to Delhi.

The tally includes four deaths and 18 people have recovered and discharged.

The total number of COVID-19 positive cases in India crossed the 4,000 mark, mounting to 4,067, said Ministry of Health and Family Welfare on Monday.