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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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
The comment posted from the Facebook account of Shankar Prasad read:?“Sattavarella Christaralla, Namagenu Bidi” (All those who died are Christians, why should we bother?).
Comments
now innocent children are also not spared by hindutva
These kids are like clan flowers not seen the world. Very innocent.
How a person can have hatred OR enmity with such innocent kids.
This guy does not represent all Hindus, this is his own corrupt ideology. However his fellow Hindus have responsibility to correct him, to change him by hook OR Crook. One guy spoils the name of entire community is not acceptable in the civil society.
We are with the saddened parents and friends of these kids.
Uneducated goons and their leaders.....expected......when this guy dies please notify in media so the whole world can comment....Sattadu ondu naai alla ....municipality garbagige haaki....
shame on him no matter what he is or which religion he belongs to, he is not worthy of being human.. if he has no mercy for humanity.. put those aside, we have more people from different community who prayed for all those blessed souls.. today i attended juma in one of masjid.. and there was dua after prayer including these children's n all those who passed away in such tragedy. #beahumanfirst #humanityismypriority
RSS and Bajrangi has become more dangerous for human. They started to think like animals.
After worshiping stone for many years their heart has became stones permanently.
WHAT one can expect from this inhumans, cruel communal minds,even animals have mercy to each others and they express it some forms, but these so called chad.....is are now proved to be worse than that.. may the almighty creator protect the people of our nation from such ANTI HUMANS..
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