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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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
Comments
Kumar!! Shut up!! Don't blame his parents, and exactly nobody know what took place there..
Rider must have controlled the bike... So it depends on rider, how he rides..., imagine how hurted parents are? Instead blaming them...
And think twice before you type sh*t
Dear Mr. Kumar, your comment reflects your immaturity, lack of understanding of the situation and although I'm sure your intentions were at the right place. I would like to tell you that the deceased and both the parents were not fools. Only you seem like a fool here for that insensitive comment. I hope no harm comes to you and ur loved ones and you are not called a fool for it. I wish you a safe life. Also, I hope you did pray for the departed soul.
Dear Mr Kumar, your comment shows your lack of understanding of the situation. Also the parents were not at fault here. Since you didn't know the person and since the full situation is not given.. I would suggest you would shut up before passing blame or using such words about the deceased person. The person and parents were both not fools. The only fool I see here is you. I suggest you stay safe though. And no harm comes to you. And people not call you a fool after such a tragic incident. Also thank you Mr./mrs.shaji for showing maturity and decency.
Dear Kumar, we cant blame parents. sometimes, they are helpless agaisnt the hard will of their kids. Some boys even say to their parents that they will discontinue study in case their demand is not met. May God bless kids with correct way of life.
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