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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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
one of the chut#yst man i ever seen in this news portal..do you think modi is internet email so all the people with him...first change your cow dunge to human brain and come to mangalore for treatment...
Doctor name Dr Kamath surgen 9967453786...
is it ok for you to replace with bakra brain...then dont blame muslim for that..reason we have sortage of human brain due to election
Ananth Kumar, what have you done for the people other then living the life style of the rich and famous with the poor tax payers money and warming up your seat. Nobody can match Siddaramiah he has done 100 foldes of you guys had done.. BJP leaders have nothing tangable to show that's why you guys keep bring up the watch issue. Please vote for Congress! so Siddaramiah can be our CM for a better future for the people of Karnataka.
Moustache still black by the grace of Kolesston colour but Laak chupawo Chupna sakegha Jhoota bjp walon ka jhoot ka chehra. Shakuni mamoo next mp election u will not be anywhere in Karnataka Map.
Wait and watch. first leg will be within a week and the final leg 2019 supda saap no adress of bjp or rss or u.
Anant, thu kasan sangtha maraya, lutha bais. 15 May pale Kazan zatha mum. Yeddi che chaddi votha.
Dear Ananthkumar, you are able and fit leader to be next CM of karnataka. You are always tellig the truth and open to all. We, the people of your constituency fully support you as our care taker and helping us. You are like our God Father.
Anant Kumar is 100 percent correct. Cogress will not get a single seat against the wave's of MODI and YOGI. Our great national hero leader PM Modi has already told that people of Karnataka have made their mind to kick out Congress and select only BJP in karnataka and to be followed by Kerala, Tamil Nadu and Andhra. I think Electon Commission should stop voting in Karnataka to save billions of Rupees as people have already informed our Leader great Modi that they will vote for BJP only. It will be a waste of money for Congress and other parties also as BJP is going to sweep almost all the seats. Our PM is a great astrologer and has dreamt about the win in Karnataka and whatever he dreams it comes true. He had dream of becomingPM of india and it became true. He also dreamed that he will visit also all the countries in the world and its nearly completing as he has left only few countries to visit. Jai Modi ji . Jai Hind.
All Bjp leadrs are day dreaming for power in karnataka which will end on 15th may 2018.Let them happy upto that day. JAI KARNATAKA JAI INDIA.NO FEAR INDIA IS OUR SLOGAN.
Ananth Kumar and Anant Kumar Hegde, both are same in mindset. always spits nonsenses
A study shows BJP is 'richest' political party and the money not in the name of party it's owned by BJP leaders individually. They are not showing it while filing nomination and they are not paying income tax also
The irony is, cow dung fools are criticising normal people
Soon BJP will be eradicated from India due to Computer baba, rapist BJP MLAs, Yogi and Feku etc
In other countries, ministers and elected persons will be highly qualified specific area focused people. Here in India, all BJP MLAs and ministers are some cow dungs
India will be free of BJP due to Modi and his MLA fools
I am not a supporter of any political leader or party. But yeah i'll definitely choose a candidate wisely while voting irrespect of his caste or party.
Mr. Ananth kumar what you know about the facilities the present govt has provided for the farmers by sitiing in Delhi?
Mr. Siddu ( I am not a suppoter of him anyway) has done Something for the farmers of his state. Dont blindnly fool the people of karnataka.
Its sad that farmers are ending their lives all over India..
Add new comment