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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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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, Jun 7: Suspense over JD(S) patriarch HD Deve Gowda contesting the Rajya Sabha polls from Karnataka with Congress' support continues as KPCC president D K Shivakumar on Saturday said the party has fielded one candidate and the high command will decide on what do with surplus votes.

Mr Shivakumar also said his official takeover as party state unit president is likely to take place on June 14.

"Whatever our national leadership will decide... For now we are fielding only one candidate, regarding surplus votes whatever our high command says, we will abide by it," he said in response to a question about supporting Deve Gowda.

Polls for four Rajya Sabha seats from Karnataka is scheduled for June 19.

The Congress, which can win one seat with its strength in the assembly, has fielded veteran party leader Mallikarjun Kharge as the candidate, while the BJP is yet to decide on candidates for two seats it can win.

The JD(S), which has 34 seats in the assembly, is not in a position to win a seat in Rajya Sabha on its own, and will need support from one of the national parties with their surplus votes for this.

Minimum 44 votes are required for candidates to win.

Speculation is rife that congress is likely to support JD(S) with its surplus votes if the regional party fields Mr Gowda, and in return may seek favour during legislative council polls slated later this month.

Though JD(S) legislators are of the unanimous opinion that Mr Gowda should contest Rajya Sabha polls, the 87-year-old leader is said to be undecided and weighing options.

If he contests and wins, this will be the second Rajya Sabha entry for him, the first time being in 1996 as Prime Minister.

June 9 is the last date for filing nominations.

Stating that on June 8, Mallikarjun Kharge will file his nomination for Rajya Sabha polls, DK Shivakumar requested party workers not to come to Congress office or Vidhana Soudha, where the nomination will be filed, because of the COVID-19 pandemic.

"Let your love and affection continue, but let's not create problems by gathering here. After the election is over, and once he (Kharge) wins, you can greet and congratulate him. Let's not bring a bad name to his seniority for not maintaining social distancing by gathering," he said.