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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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
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Ache din ki maa ki aur Modi ki .....
Modi visits all country for yoga publicity.
Why he is silent on protecting cows(hindu god) in foreign country ?
RSS and all hindu Groups should approach foreign country to stop killing their Gods, If foreign country rejects their proposal then they should take actions to boycott foreign goods.
Is there any man in RSS or Hindu group to stop killing of Hindu God in the world ?
Impotent people can bark in their boundary only with their hired media.
After all God is more important than Yoga.
WHO ARE THE JUDGES?
NOW A COW IS SAFE THAN A HUMAN BEING.
AMERICA imports and eats hindu god daily. Why modi is silent on this issue ?
He should approach other country to protect hindu god. Which is weaker by nature.
Impotent justice from impotent people. Expecting justice from idol worshipper is totally wrong.
Kabir Meat exporting company is run by RSS people. It kills millions of Hindu God daily.
Why there is no FIR against them?
Modi has given subsidy to kill hindu god.
If the did kill a cow they do deserve punishment , Did modi make him kill a cow ?
This is called justice....?
Modi Government is trying to get these murderers out from the jail to use them in the upcoming election in Uttar Pradesh....what a tragedy...there is no value for human kind...no humanity left in this country...by hook or crook these crooks want to rule the country....
HEADS UP TO OUR INDIAN LAW,
ACCHE DIN KI CHAMATH KAAAR...
Delay tactics to Justice, so grieved family get fed up by this way...common ppl loose confidence on law system in our country
Why there is no FIR against Sangeet Som who is killing cow every day and exprting under Al Anam and other company name? Can the activists and govt take any action against this guy?
What a joke yar,,,,,,this is the stupid RSS and BJP
A big Joke of the year
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