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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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

Bhatkal, May 9: A day after 12 covid-19 positive cases reported from Bhatkal, seven more tested positive for the coronavirus in the town today. 

The new patients are: a six-month-old baby, a two-and-a half-year-old child, two girls aged 17 and 23, a 50-year-old woman and two elderly men aged 65 and 68 years.

The source of all these cases is said to be the First Neuro hospital located at Padil in Mangaluru where a covid-19 patient from Bantwal had undergone treatment a month ago. Around 20 days ago an 18-year-old girl from Bhatkal, who had been to the same hospital was tested positive for the covid-19. 

After the confirmation of 12 covid-19 positive cases yesterday, the throat swab of 60 people, who were in contact with them were sent for testing. Among them seven people – six relatives and a friend – were tested positive today.

Also Read: 12 new covid-19 positive cases in Bhatkal

Bengaluru, May 20: 63 more COVID-19 cases have been reported from Karnataka, taking the total number of coronavirus cases in the state to 1,458 on Wednesday, said the state Health Department.

The total number of cases includes, 864 active cases and 41 deaths (one due to non-COVID cause), it added.

Total 10 people have been discharged today while 553 persons have been discharged so far.