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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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
I think this is the best way police can do. Whoever do mischief and creating problem in their town should throw them to other state for 5 years. Istead of putting them in Jail.
They not allowed visit their family upto 5 years. Then they knows the values of human being.
send him to hell forever. he is a culprt
Kick him out to china or pakistan border
Huballi is not far....send him to Andaman.....or Saturn would be better....
Good Move... The authorities should recognize the trouble makers and give harsh punishment so that the society will be peaceful...
There are many authorities who wear bangles and fear the cheddis. its time to know that cheddis evil power are diminishing day by day and there is no need to worry and live in fear.
The authoriites should do their jobs without fearing the consequences... Do good to the society ... God's help come when our intention is right.
He should have been booted out at least for one year... so that other monkeys will learn .... He may be following the foot steps of his Guru Mutalik and may be demanding 10 laks to start a riot .....
Good Job done by the district police. he should be thrown behind the bars for ever for disturbing peace
Kick them out of Country.Waste Bodies.
Hats off to super star nukul (mr.s.s.nukul), d.c of uttara kannada, for at last showing the guts and courage of
Power of his respected post, to maintain the law & order of the district, by thrwoing out this so called \gandi naali ka
Keeda\" out of the district for the benefit of the peace loving people belonging to all the communities, who are allowed to live & let live harmoniously. Long live india & indians. Jai ho."
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