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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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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Can anyone knows the PAN of Karnataka Chief Minister Relief Fund Natural Calamity 2018
I want to download the receipt for my donation of Rs.5000/- made to Chief Minister relief fund Natural calamity 2018 through Online on 29/08/2018 to a/c No.37887098605 in S.B.I vidhanasowda Branch from my SB a/c in Indian Bank. Prashanthnagar Branch
Contribution for Kodagu flood relief
Now there is an option avaliable in Paytm to donate online for Karnataka CM relief fund (Kodagu) . pls find the link below
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I am not able to donate direct online to Chief Minister's calamity Relief Fund through net banking.I have failed in my repeated attempts .Plz let me know.
I wanted to donate to Kerala CM Flood relief and got it done online within 1 minute. I am finding it difficult in Kodagu case. How do I donate online?
I have to donate money to my people
How do I do?
Kodagu Relief donation of Rs 2500/-
i want to donate for kodag flood relief(karnataka)
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