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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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
Ananth Kumar uncultured, absolutely unfit as a politician.
This man is the worst crazy type of person as peoples rep.
You can imagine if a MP is behaving like this, what could be the credentials of his party and those who elected him.
He is so stupid, he does not have brain to think, that
To follow any religion, is required who is his father or mother.
Our constitution fully empowers every citizen to follow the religion of their choice, propagate it
also.
No religion refuses anyone from following their choice of religion.
Is Rajeev Gandhi Muslim.
This so called MP does not know also, Rajeev Gandhi’s father Firoz Gandhi was a Farsi man.
I hope Rajeev Gandhi is Muslim, but we know he is not.
Becoming Muslim is it sin. Muslim means person who submits to the will of his creator the God.
I can prove that Hege’s ancestor Father was Muslim. Our first father Adam was Muslim, biologically all were Muslims. Again Muslim means person who obeys or submits to his creator.
But later as they grow, they inherited their parents or chose to remain their parents religion.
Is it sin. This is what requ
This man is the worst crazy type of person as peoples rep.
You can imagine if a MP is behaving like this, what could be the credentials of his party and those who elected him.
He is so stupid, he does not have brain to think, that
To follow any religion, is required who is his father or mother.
Our constitution fully empowers every citizen to follow the religion of their choice, propagate it
also.
No religion refuses anyone from following their choice of religion.
Is Rajeev Gandhi Muslim.
This so called MP does not know also, Rajeev Gandhi’s father Firoz Gandhi was a Farsi man.
I hope Rajeev Gandhi is Muslim, but we know he is not.
Becoming Muslim is it sin. Muslim means person who submits to the will of his creator the God.
I can prove that Hege’s ancestor Father was Muslim. Our first father Adam was Muslim, biologically all were Muslims. Again Muslim means person who obeys or submits to his creator.
But later as they grow, they inherited their parents or chose to remain their parents religion.
Is it sin. This is what required a person to be loyal to his creator and obey his creator.
May God give wisdom to this man and save his followers.
ired a person to be loyal to his creator and obey his creator.
May God give wisdom to this man and save his followers.
This person is mentally sick and does not know about parents of Rahul Gandhi. He thinks everyone like him who has no trace of his own parents. This Gowda has no trace from where he came. He should be kicked out to andaman to live with monkeys, apes etc.
this man have more more hatrate to mulsim community..
after 2019 they will make you to count your sin did in past..
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