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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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
Yedi & Shoba Always to be in Media with no Reason. Why is Media promoting when BJP says Madrasa is giving rise to Terrorist. Media is blowing things out of propotion. What happend with Hemanth Karkere(HK)? Who Killed him? He was telling the news of actual terrorist in India. Hope everyone remembers what HK revealed. I dont support any of the party. But BJP did biggest blunder by doing demonitization. Just to make their money white. People please grow up. See the Petrol price HIKE happening. Why SHELL petrol does not have Subisidy? Why GST is not introduced in Petrol ? There are so many things to think about. These people play with law & order. See yeddy is so confident giving Dhamki to Police. Only god can Save us !!!
The common man of India is struggling for fulfilling his basic needs, he wants peace, he does not need leaders who divide society on caste and religious grounds and create chaos and hatred in the country.
Well said, Most of the BJP leaders are responsible to created violation.
Statistics show that more Indians have been killed by RSS than by Pakistani terrorists.
Who then is worse?
Is she a member of parliment or she a member of RSS, I havent seen any statement from shobha who has talked of development from her mouth. every time her statement is about RSS/sangh parivar, Does she deserve a MP seat? its better she owes her full time to RSS intead of being a MP. Shame on her she represents the whole constituency not only RSS AND SANGH PARIVAR TERRORISTS
what STRATERGY to DISTURB PEACE OF OUR NAMMA NADU KARNATAKA
Fact is a fact, why Amit shah is not in the group,who is the main culprit holding 14 muderes on his head
"BJP gay nachgayne Illa",
if they have little shame left all these leadres would have not come to street with head's down for their super leaders who committed the crimes,
Indirectly it shows that they confirms what Mr Siddaramaih says..!!!
"nanu BJP nanu RSS", not full
"nanu BJP nanu RSS nanu BrahminBaniaJumlaParty", better!!!
Hindus beware of Brahmin Domination in RSS, they dominated exploited non-brahmins for past 5000 years, dont let them control us!!!
All are equal in Democracy, RSS is a Rascist organisation, majority leaders are Brahmins! Dont forget!!!
Congis are ######s, they were responsible for 1984.
Bjp are ######s, they were responsible for 1992, 2002.
Indira made a political decision, bad decision BUt a political one.
Advani, Joshi, Uma bharati gave speeches in Ayodhya which started riots killing of 3000 people.
Both parties have blood on their hands.
Both need to be sacked and someone better needs to be brought in.
@Truth
Excellent question. The current vicious atmosphere is because of them
Who perpetrated 1984 anti-sikh riots? RSS?
Good decision. Please go and sit in jail.
Nanu shoba matthu yediyurappa naau bjp rss bajarang te ... r.. r ... t ect.....
Another comedy by Sho-bokka. Please try a good mimicry
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