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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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
New Delhi, Feb 20: Syed Qasim Rasool Ilyas, father of Umar Khalid, a PhD scholar at Jawaharlal Nehru University, has claimed that he received a “death threat call from underworld don Ravi Poojary”.
Comments
Dear Rakesh.
We know how brain is working after cheddi media & teaching have affected U.. and 95% of the cases charged are still not proved and the cheddi authorities are playing with the dumb spectaters like U who support them without your own investigation on the cases which still did not give any proof..... anyway A day will come to judge such cases where innocents have been trapped and the one who gave us this life will judge and on that day no cheddis will come to your rescue for your blind support now. Which U will regret for not using your god given intellectual. Try to know the reality and study on cheddi deception.
Rakesh,
Jamate Islami Hind an institution have no connection with Simi. SIMI is a independent institution which banned now. Its a student movement like ABVP. Jamate Islami Hind have student wing is SIO. I don't know where you got the information that he was with SIMI. Can you furnish the details about the Syed Qasim was with SIMI, failing which you will have apologize in this forum for non authentic information.
SQR Ilyasi we are with you...A goonda coward who is sitting abroad is preaching Hindutva patriotism ..As a Muslim we are not scared of these death threats
this man was with SIMI ... what else we can expect from his son ? Mr Abdullah , clarification , not India , it is muslims only and some left mentally retards . May be he has support from pakistan .
No worry ... India With U. Jai Hind.
Dont worry guys.... for the threats
Allah gives life & death and we muslims believe that.. If you are firm in your belief.. Just pray to him and ask his protection ... Dont worry about the evil .. Unless ALLAH gives permission nothing on the earth will move... even the evil of ravi poojary..
TRUST ALLAH, U are on the safe hand unless ALLAH decreed on U. even if U are harmed. It is the matter is with ALLAH.
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