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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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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, Jul 17: Karnataka Medical Education Minister K Sudhakar held a meeting through video conference on Thursday with private and government establishments involved in testing and treatment of COVID-19 in the state.

A total of 51,422 cases including 19,729 recoveries and 1,032 deaths were reported in the state till yesterday.

On the same day, K Sudhakar also paid a surprise visit to the Bengaluru's CV Raman Hospital and urged the administration to follow COVID-19 guidelines properly. He also took stock of the hospital's preparedness to fight the deadly virus.

"Surprise visits will continue. I will be in touch with every lab and get the right number of tests done on a daily basis," the minister said while speaking to the media.

He also urged the people who have recovered from coronavirus to donate their plasma to save other lives, adding that donors will receive a reward of Rs 5,000 as a token of appreciation.

Bengaluru, Jan 8: CISF personnel at Bengaluru airport on Wednesday detained two persons after they found two live bullets in their baggage during the routine inspection.

The detained person, said to be of a Mangaluru origin who arrived at the airport on Wednesday morning has claimed to be serving the American military. His mother who had arrived with him too has been taken into custody.

According to officials during the questioning, the man said that he was on a leave and that as he had hurriedly packed his belongings at the last minute there was a possibility that the bullets might have fallen into his bag mistakenly.