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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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
Is Modi Govt taking care of indians or UK. Is he PM for UK or India. He has already sold India in the hands of foreign investers and now selling indian assets also which was inherited from old kings. May be Modi will sell Taj Mahal, Qutub Minar, Vidhana soudha, Srirangapatna Mandir, Kollur Mandir to foreigners and make money for bjp and its supporters. shame on you bjp Govt. It will be better to kick out this Govt very soon otherwise we Indians will be completely sold out to foreigners. Beware of this looter's Govt.
Cheddi fans are BLINDLY supporting him. Start opening your EYES ... Looters have no issue and those helper who in the first place helped the british to loot the KOHInoor has no issue... Its not new.
Modi Govt. is a very big fake and rubbish Govt. any promise they fulfilled till now..?, hope their term will complete very soon after that only Acche Din will come..
After all RSS is the agent of British raj. How can they go against their
will ? THE REAL NAME OF RSS IS ROYAL SECRET SERVICE, which was giving then British rulers information about indian freedom fighters.
They are their sole agent then and even now.!
BLACK MONEY BHI NAHI KHOHINOOR BHI NAHI
Waah thief waah!!!
Next he will tell British never invaded India.
We invited them to learn to wear bikini.
RSS is the enemy of India.
It did not surprise me... We know cheddis partner during freedom struggle...
I think Kohinoor diamond belongs to Mugals (Shahajan). how Ranjith Sing is gifting British
Yes, its nice to see it with queen rather than kept here in India...someone will take it if it is kept here....can't trust....
Same like \National Herald is gifted to Sonia Gandhi and not looted by her\" as claimed by Congress party."
If a slave gives a \gift\" to his master, there is always room for reinterpreting the idea behind the \"gift\". But if the new masters are not different from the old, how can this happen? This is the tragedy of India - and this is why we ought to see that the Cong, BJP, CPI etc are actually a continuation of the British colonial legacy. You can defeat them in some cricket matches, but when it comes to substantive issues, you concede the match even before it begins. This is the colonialism of the mind."
Look like air leaking from 56inch chest.
Soon it will be 26 inch.
This decision of govt also justify
British rule over India.
Shame on BJP.
bjp and rss revere godse, the criminal who brutally killed Gandhiji. bjp/rss are agents of british
We want Kohinoor back, who is government to tell them to keep it and they then call themselves as nationaliats. These are real anti-nationals and agents of British.
@Tolerant Indian: Disappointing. The Brits don't deserve our Kohinoor. But if was a gift, then we shouldn't be expecting it back. Blame our Maharaja of Punjab. Height of MASKA GIRI.
Tolerant Indian: spineless modi. Kohinoor belongs to India. it is India's shaan. lalit modi now vijay mallaya took our money to UK. farmers and poor are committing suicide and government gifting riches to other countries.
@Tolerant Indian: Indians have the generosity to make the world rich, by gifting and stashing money in foreign countries!
We have had gifted everything to British during British rule! And now our Rich Indians started gifting by moving out of the country to get settled in UK? There is no surprise, everything is fine in Love to English!
Bring Kohinoor Back Kohinoor was our heritage, it should be brought back.
Kohinoor wasn't a gift. But a war prize that was pushed down our throats by sly East India Co. Better revise stand.
Everyone knows that RSS is always acted as British agent.
Kohinoor was not stolen from India. It was merely abducted. Shine On You Crazy Diamond.
Someone just told me 'we have enough gems in the govt, who needs Kohinoor.'
Okay Britain, let's do a deal. You give us back on thing we gave you - Kohinoor. We'll give you back one thing you gave us - Section 377.
modi govt run by buffoons: Kohinoor gifted by Ranjit Singh to brits? he died in 1839, brits snatched diamond in 1849!
After all, the difference between \gifted\" and \"lifted\" is just one letter."
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