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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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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Dears even if prophet (pbuh) did not ate beef ,never deneyed it to his rollovers ,what is halal and what is haram is clearly mentioned in Quran, but for a beliver its not compelsory to eat beef to prove his belief it permisable one like mutton and chicken or veg it depends upon the place, whether, biographical condition ,ect, here not only Muslims meeting beef people of,so many other religion also eating but only Hindus worshiping it this is fact ,,one more thing people of different parts of the world eetind beef since human eyes but problem begins only it created a vote bank ,,now real Hindus should prove what is real hinduism which permits to kill human for the name of cow? Still cow know nothing!!
CRAZY man half knowledge , makes him crazy to express wrong words
Dear CD
Don't support by publishing un islamic topic from so called Muslim (Nawzbillah)
Beware of such people,
Our bellowed prophet peace be upon him, said anybody who lies as misquoting against him, shall reserve their place in hell.
We should ask him for authenticated proof, sure he will fail to do so, then people have to decide his fate on the grounds of sharia law.
Better change your name to Tarak Mehta :-)
Hello, who is this Tarek Fatah, Agent of RSS, what he know about Prophet Swallahu Alaihi wa sallim. Where is quoted beef is Haram in Qur'an or Hadith.
What he is talking even not veda, purana, ramayana or in Mahabharatha there is no single word against slaughtering cow. 10000 of cows and other animal slaughter in yaaga, yajna.
Prophet Muhammed peace be upon him Told be aware of MUNAFIQs like you . and also mentioned that the day will come when Ignorant will become leaders ......so you try to become......you are going against ISLAM by claiming something Haram when its allowed in ISLAM
May be one day you will say PIG also allowed....!!!
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