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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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
Who is mother in law ?
\ Beary\" is grand papa"
Konkani is your mother in law....
hi..
kannada is mother, tulu is father.. then who is cow? not anymore Gomatha????
India is Mother,
Cow is Mother,
Karnataka Is Mother,
Father only one TULU...
Iddu yentha vipariyaasa kanri. Thai ge belene illwa kanri.
Kandu kandavarennalla Thai Antharalri Ivaru...
Adakke kanri namma VIREN Sahibru Thai land nalli kuthiruudu.
Humans have their own human mothers
Animals have their own mothers
COW is the mother of CALF
U Were silent When Cheddis were killing the human in the name of Cow mother
Please dont make another fake mothers to create trouble in the society
People have started thinking now
They dont want FAKE MOTHERS
They want to take care of their OWN MOTHER who gave birth to them...
WE RESPECT U BUT please dont think WE ARE ALL STUPID TO FOLLOW WHATEVER U SPILL...
IS IPHONE 7, WHICH RELEASED YESTERDAY, IS ALSO UR FATHER??
iphone 7, the father is released yesterday.
:)......
Please do not add one more to ur parents list. We are confused what and who are your parents.. Already there are many.. now pls do not add more..
I thought Cow is ur mother. totally how many mothers and fathers u people have.
Kannnada occupied mother's place. What about poor cow? fed up with cows?
Joke of the day!
Mother, Father.
Mother, Father.
Mother, Father.
Each and everything is a Father or Mother.
But, finally ignore real mother and father.
They end up on roads or old age homes.
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