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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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
Muslim religious heads and Khazis across Kerala and coastal Karnataka unanimously announced the date of Eid as the crescent moon was sighted in several parts of Kerala on Friday night.
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Offensive OR Defensive ..... Prevention is always, always, always ........better than CURE..... I wish , what happened to Praveen poojary should not happen to others .....
Dear SK
Dont be defensive... What CD mentioned is true and ALLAH made halal to sacrifice Camel, Cow , Goat or sheep which is also a Creation of ALLAH.... Cow is an option which is helpful to the POOR to sacrifice for the sake of ALLAH.
Dont think cheddis love Cow. Thats a fake love which they want to divert from the hindu masses to see them as bhakt.. Dont U see Cows are dying in the Gowshala? & smell are coming out in all places even in rajastan.
Its cheddi ideology to fool people ... Even in VEDAS we see many kings and hindu priests eating Cows...
So dont be defensive... Cow is HALAL . ALLAH, the creator of U, ME and all that exists has made it Halal...
In ISLAM, when U sacrifice, U will share the meat with U, Ur family and the Poor of your area... when we see in other culture, they sacrifice and bury the cows and buffaloes in the earth.. No benefit only loss of cows live...
I kindly request the Media to check before reporting.... For Qurbani, cows are seldom used, only buffaloes , bulls, goats, sheeps are used...
Such misreporting will encourage the sanghis like Naren to attack Islam
???? ???? God is Great
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