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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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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, Apr 15: As many as 17 new positive cases of COVID-19 have been reported in Karnataka, taking the total number of cases in the state to 277, including 75 discharged and 11 deaths, the state government said on Wednesday.

Of the 17 new cases, nine are workers of a pharmaceutical company in Mysuru, the government stated.

Meanwhile, a 65-year-old from Chikkaballapur, who had tested positive for COVID-19, lost his life on Wednesday.

"He was referred to a Bengaluru hospital with complaints of H1N1 positive, Chronic Obstructive Pulmonary Disease with obstructive sleep apnea and a past history of diabetes and hypertension," the government stated.

Bengaluru, Jul 20: The Karnataka Congress on Monday slammed the State government's decision to distribute beds used by COVID-19 patients to Government-run hostels and called it as a "ridiculous" decision.

"It's ridiculous that the Govt plans to distribute beds used by COVID patients to Govt run hostels," read a tweet from the Karnataka Congress president DK Shivkumar.

He further said that the Karnataka Chief Minister BS Yediyurappa should give these beds to his ministers, MLAs and officials.

He further went on to urge parents and students to speak "against this move" by the State government.

"Let CM @BSYBJP give these beds to his Ministers, MLAs & Officials! We are launching a movement against this Govt & appeal to parents, students & youths to speak against this move," Shivkumar's tweet read further.

Along with the tweet he also shared a video as well.

Karnataka reported 3,648 COVID-19 cases and 72 deaths on Monday, taking active cases to 42,216 and death toll to 1,403. Bengaluru recorded the highest number of cases and deaths today at 1,452 & 31, respectively, said the State Health Department.