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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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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, April 3: Messages have been displayed outside mosques in Shivajinagar requesting people to offer Friday prayers at home during the lockdown imposed in the wake of the COVID-19 threat.

In light of the coronavirus outbreak, several Muslim organisations and mosques across various states have temporarily halted the congregational prayers.

The usually bustling Jama Masjid area, today, wore a deserted look.

One new positive case of COVID-19 was reported in Karnataka on Friday.

The patient is a 75-year-old man from Bagalkot and has been isolated at a designated hospital in Bagalkot, the state government said.

"Till date, 125 COVID-19 cases have been confirmed in the state, this includes three deaths and 11 discharges," it added.

The total number of coronavirus positive cases rose to 2301 in India on Friday, including 156 cured/discharged, 56 deaths and 1 migrated, as per the data provided by the Ministry of Health and Family Welfare.

Udupi, June 21: A graduation student, who had attempted suicide two weeks ago under depression following the postponement of examinations due to covid-19, breathed his last at a private hospital yesterday. 

The deceased has been identified as Shakuntala, a final year degree student of First Grade College, Muniyal. She was a resident of Mathibettu near Vagranga in Hebri taluk. 

According to sources, she had studied hard to clear the examinations. The postponement of examinations led her to depression.  

She consumed poison at her house on June 8. She was immediately rushed to Manipal hospital where she breathed her last on June 20. A case has been registered in Hebri Police Station.