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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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
Viren Kotian,
Kumar,
Yogesh,
Danish.
George
Shiva
Naren,
Please guys, U guys with all worldly intelligence look like FOOLISH... Dont jump to name an innocent as Terrorist...
Think before YOU blame others
Only U wake up when it happens to you or your own families .
When some is blaming without PROOF ... They are called FOOLS and HYPOCRITE.
Please next time use your God given intellectual and VERIFY before you jump like MONKEYs...
This guy is proved innocent and you guys are proving us that WE can make U dance with any news that is presented to YOU Guys cos U guys never USE your intellect to VERIFY what is Said...THINK and PONDER.
Naren Kotian ......if you need the proof, pls visit the Bhatkal police station and find out who placed the meat bag in NAGABANA to create disturbances ..... this Bastard terrorist should be nakedly hanged.....
wow superb ... third rated jihadist ... hang this bastard ... mostly he arranged passports for islamic state or ISI porkis to conduct bomb blast ... rikacha sumne koorappa, jaathi buddi yelli bidtheera .. we are seeing how your community is doing , proof beka .. proof kotru neev accept madalla .. so waste .. burnol kodla rikacha ?hahahaha
Also arrest the officials who issued him those passports......they are the sponsors of these terrorists.....where are the officers who made his verification.....don't let people laugh at our passport agencies and government.
Do not count chickens before they are hatched? It is normal that painting Muslims with anti nationals and terrorists etc.....
Super and timely catch... Now Amnesty international will start fighting for this anti national's rights. We should make sure he does not escape.
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