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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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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No need to point thier members, they all are the wings fo desh drohi RSS. In Karnataka all will epxerinece their
communal and hate speeches only for vote bank. They might think by the name of cunning religion and caste polcy they will succeed to devide our Great country. In INDIA normal citizens will never accept RSS groups policy to accept their upper caste and lower caste Hindu policy and targeting other religion.
Rest of the Nations are living peacefully with all religion why can't we .
India is the only country in the World fight against dirty british invader with Non Voilance. For that we all to salute the great man Mahthma Gandhi. RSS criminals never supported or they parcitipated during nation freedom strugle with dirty britishers. Now they are looking to devide our Nation but never, hence we all have to stand together ; be unite to save our NATION form these evils. Then no time very shorlty their organization and their criminal institutions will be vanished from all corners of NDIA.
Jai Hind! Jai Karnataka !
These disgraceful caste based un secular Muslim appeasing Sid Ra Miya of Conning-ress, is equating Bajrang Dal & RSS with some of the parties (A--i Na---al) which it sponsors, RSS has proved for many years that it is a party doing many social services, this cheap fellows will be in power for barely another 4 months
CM has problem in a mental stablity ot he is drunk should we call for ban for Congress Muslim party who looks for their votes
Sid RA Miya, Conning-ress, & Parakasha Rai/Raj are already Hob Nobbing with PFI, SDPI, & many similar organizations directly & clandestinely
@Mangalurean. Very few sane, Hindus, have such guts. Others all are chameleons..and turn color whenever get a better chance.
I wish, he was not in Congress, which helped RSS grow into such a giant organization and now a school of teaching hatred to innocent common Hindus.
Salute. Many common Hindus feel the same way, unless they are in politics.
So the President, Vise-President and the Prime minister are terrorists? India is a terrorist country now then. This idiot will be shown his place in the next election.
BIG sallute to Siddaramaih!!
HE the CM of Karnataka has guts to speak the truth of hidden Agendas of against our nation as well Karnataka...!
in fact who killed the BOMBAY POLICE CHEIF of Mumbai, its RSS becouse very soon he wanted to open mouth of big shots who are enjoing the government protocol and security today..
Almost all leaders and prominents in India are THUGS but some also TERRORISTS.
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