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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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
Ali Khan aka Don, who contested the 2013 Assembly elections from Bidar South, had made a video denouncing Saeed for his remarks on the Uri terror attack and the “surgical strikes” carried out by the Indian Army. Ali posted the video on WhatsApp and it went viral.
Comments
Pakistanis have crossed the limits .India must nuke them...may be they might fire few nukes ...but India even after losing some population will be there ...Pakistan is a curse for entire world ...I sincerely request our powerful pm to conduct massive attack in Pakistani soil..our Modiji really on right track be it in black money ..70,000 crores in just 4 months its something amazing and he came to states help during kaveri crisis .my vote and my family vote next time for BJP.please give chance to real Muslim leaders like mr Abdul azim in the new govt .we are sick of chaprasi congress leaders.
Jeevan, Dubai is not in India....you need to go back to school....
in my opinion he should return back to india, they are more powerful in saudi. if they have guts come to india and threaten them only one shot will bhoom them to hell.
Ali khan is a real indian, this big hole pakistanis cant do anything to him or his son,
hijda pakistanis always play hide and seek, come infront and talk bas***ds.
No need to worry aamir.. pakistanis always toss.. they only know to bark they wont bite.
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