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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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
My dear Venki...I say that both are not same as u said.. Do u know why?
1. Sadhivi Prachi always gives her hate speech. Like kill them kick them out of India.. Salman khan amir khan.. oh khan yeh khan.. many more as u know...
2. Zakir naik says Islam is pure rest others are not a true.. He doesnt says throw, kick, kill etc etc.. If you have any doubts you check from google bhayya and make it clear.. so dont compare lion and dogs! Lion is lion and dogs are always dogs it will never become lion :D
Zakeer Naik has more Fans - Hindus, Christians than Muslims.
His Fans are mostly highly educated, intellectuals.
He never advocates hatreds, animosities. He says truth which are wrongly practiced not following their own respective scripts like Veda, Geethas.
His knowledge in Hindu scripts are more than any common Swamees, pandiths.
Dear venki,
Your statement shows how much innocent you are. How you can compare prachi with Zakir? Did Zakir hate any religion? he is comapring the religions. He is showing what is in hindu scripts mentioned and what you are practising. Example, in vedas it clearly mention that idol worship should not be done. How many of us worshipping Idol? Did Prachi talk about Veda any time? If you listen her speeches it is spitting venom.
He has working, serving the people even with his all wealth, without seeking any personnel benefit. He has been doing it at least last 30-35years as I know it.
It would have not taken this much time to find any irregular activity if he has been committing such.
If does not need much time to know any anti social activity.
He is very much openly operating his activities obeying all the norms.
He is more popular in Europe and US, other countries than in India.
For some people it is very much difficult to digest his popularity and his fair activities.
Unfortunately those Sanghi brothern or Sanghi sympathizers can understand that he is rescuing them from their unknown mistakes.
Whatever he is doing he is not seeking any worldly benefit.
He has a strong faith in God, his sincere efforts will be rewarded in the other permanent life (which will be after death).
Really every Indian should thank God Almighty for bestowing such sincere person.
May God help us to understand truth and Guide us.
Modi's U turn....
TRUTH PREVAILS AND FALSE WILL PERISH...ALHAMDULILLAH
ZAKIR NAIK BECOMES MORE POPULAR....IN'SHA ALLAH
CHADDIGALIGE BURNOOL BAGYA
It is UNIVERSAL truth that he is innocent and just focusing on ISLAM. May almighty bless with you good always.
It is really good news for Zakir Naik and his followers, I was sure he will come up clean as I follow him last 20 years he always support teaching of Allah and Hadees and prophet's teaching. He never criticize other religion but compares to Islam whenever there was Q&A session anybody asks the question. He respect other religion.
Best of luck ZN and continue your good work.
Where are the saffron mfs who were barking and somebody please shit in mouth......
what is the fate of that Lunatic and his associates who have been shouting from the rooftop 24x7.? Is his Time Now come to an END?
Whenever a genuine Muslim targeted almighty Allah saved them, this is enough to realize a mankind that Allah is only a creator of everything nothing else. So everybody should say in one word that \Allah Hu Akbar, La ilaha Illalah\""
Add new comment