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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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

Mangaluru, July 18: A man and his son have been arrested for torturing an elderly woman in Savanalu under Belthangady police station limits in Dakshina Kannada. 

The arrest came after a video clip of the duo beating the woman went viral on social media.

According to police, the duo has been identified as the woman’s son Srinivas Shetty and her grandson Pradeep Shetty.

The accused had allegedly been torturing the 70-year-old ailing woman and the video of the same has gone viral on social media.

The police have booked a suo moto case under Indian Penal Code 323, 504 and section 24 of Maintenance and Welfare of Parents and Senior Citizens Act, 2007.

Mangaluru, Feb 20: A wild tusker was spotted in Kukke Subrahmanya town here, in the early hours of Thursday.

Range Forest Officer (RFO), Kukke Subrahmanya Tyagaraj said that it was seen walking from Kashi Kattte in the town to Nuchila around 0530 hours without creating any havoc.

The same elephant was spotted some days ago at Harihara, a small village town near Kukke Subrahmanya.

It has been roaming around in the forests nearby for some time now. So far, it had not caused disturbance to people nor had it damaged any property, Mr. Tyagaraj said.

Kukke Subrahmanya is on the foot of the Western Ghats.