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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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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Goons.....say something......she was not wearing a burka
showoff...who cares..!!
Show off....who cares..!!
BJP MLAs are playing in crores. where does this money come from. Income tax officers should raid this type of MLAs for right source of income. this is definitely from unlawful activities and illegal. MLAs are playing with crores whereas poor people are carrying dead bodies of their beloved on their shoulders and baby is dying on ones shoulder because Govt hospital did not provide him stretcher. What a shame. Its shameful to our public who select these types of goonda people to be Ministers only to get enriched.
What is her age?
Yes BJP MLA's are all coming in media for wrong reasons.. They themselves living in LUxury and never care for the poor of the country.
The road condition is not good enough for these imported cars....very expensive car.....fixing dent of car will require another one crore....rickshaw guy should be compensated with at least one crore....
everybody once will hit their new vehicle somewhere. why only targeting politicians all the way, if something did by congress, bjp will highlight. if bjp congress will blame. now a days media also doing the same thing, seriously alteast media should stop their saffron views. work for the development of the society provide true news to our people.
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