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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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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 18: As many as 210 new COVID-19 cases and 12 deaths have been reported in Karnataka, taking the total cases to 7,944 and death toll to 114, said State Health Department.

Today, 179 persons have been discharged across the State while 4,983 persons have been discharged so far.

The number of total active cases in Karnataka stands at 2,843.

The COVID-19 count in India has reached 3,66,946 on Thursday, according to the Union Health and Family Welfare Ministry (MoHFW).

The death toll due to COVID-19 has now reached 12,237. The COVID-19 count includes 1,60,384 active cases, while 1,94,325 patients have been cured and discharged or migrated so far.

Bengaluru, Apr 26: Three new cases of COVID-19 have been reported in Karnataka in the last 24 hours, taking the total number of cases in the state to 503 as per Karnataka government.

There are 302 active COVID-19 cases in Karnataka presently, while 182 patients have been discharged, 19 deaths have been reported, state government informed.

The total number of positive coronavirus cases across the country are 26,917, including 20,177 active cases of the virus. So far, 5,913 patients have either been cured or discharged while 826 deaths have been recorded in the country, as per data provided by the Union Ministry of Health and Family Welfare.