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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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
The actual FACT is during Independence and Partition of India & Pakistan, British as usual left a piece of land so that there will be no peace between India & Pakistan (in-case if they join Hands they will become Super Power of the World). The only solution for Peace to Prevail is leave Kashmir to their people. Let them decide which part of Kashmir they want to stay, make partition, I know this won't be done as for political GAINS, Let the families of Politician start living in Kashmir and feel how it is to lose a loved ones. Just by blaming Pundits and Muslims wont work. Killing innocent people by either side is just to brainwash the Public and to keep the rivalry alive on the basis of religion and country.
Malala , you have yourself experienced how inhuman and ruthlessly atrocious Pakistan Government is. As they manipulated you and your family’s circumstances to harass, they are exploiting and manipulating India’s freeness and all-inclusiveness to keep Kashmir and its denizens in constant turmoil to get pleasure from other’s pain. They are doing same to Baluchistanis since partition and the Kashmiries of Pakistan held area are extremely unhappy and are in totters due to this policy of Pakistan.
Its Pakistan's fault not Indians....Pakistan should stop sending terrorists to India ...which is not happening at all....that is why Kashmiris suffering around there...
Malala should advise Pakistan government first not to involve with our domestic problems....
It is good for Kashmiris if they stay with India as far as their security and economic developments are concerned...
True that Malala has suffered beyond our imagination and came out of it bravely. But that doesn't make her an expert in everything.
Dear Malala, Can you please talk about the inhumanity and heartbreak in Pakistan-occupied Balochistan?
Malala Request you to please stay peaceful and stay happy and not say things that don't fit into ur vocab pls.
I didn't really used to like her but now my respect for her has gone up a lot.
Do you live in delusional world..what should paramilitary forces do if someone is breaking law and order of any country
Lets hope this time her voice will be heard as she has won Noble Prize for PEACE. Lets wish that India will keep Human Life above her EGO and will look Kashmir with HUMAN eye before there is no solution left
Dear Malala, Surely New Delhi government and Kashmiri people need to work together. Your concern is respected.
India in committing a genocide in Kashmir by killing innocent people SC must take notice of this.
As much as I admire Malala, I hate to see her get into Politics and Indo-Pak disputes. There are enough noises being made, or have been made, to no end.
please advise the kids to stop pelting stones and focus on studies to snatch the opportunities from rapidly growing Indian economy.
Thank you Malala for raising your voice in our support.
Since you are an influential opinion maker, I hope the world listen to you and stop the perpetrator from committing these atrocities against us.
Malalaji, Welcome to politics.
Dear Malala we respect you. But it is not government of India or Pakistan decide the future of Kashmir. There are some third parties who really want disturbance or conflict in the valley.
Trolls across the border always loved everything Malala spoke about. I hope they do the same now and accept stark reality!
Thank You Malala, for your kind words and care about Kashmiris
She is a teenage girl with little understanding of the dynamics of terrorism inspite of being a victim of it herself. The valley has been infected by the terror virus with religion which drove away the natural inhabitants of Pandits from Kashmir being hounded from mosque sermons. Many got murdered and not so lucky to escape. No one thought of their rights, now a generation has spent the life as refugee. Neither India nor local Kashmir government or the world body cares to it. However Pakistan terror export looks working well, but it is always the civilian who pays the price.
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