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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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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Naren....do a candle March for you cow maa first....then bharat maa....ha ha........we will be there in kadri....you will be repeating your bla bla.....sanghi paid goon....shitting in Singapooor.....poor fellow modiji can't help him to find a job here...what a pity in the bmj...chanters....
One Pakistani rant started chanting porkis slogan ...le farooq ....your kashmiri civilians who were killed are jihadis ... They shout anti India slogan ..sorry we dont consider them as indians at slll . they want benefits from India and loyalty to Pakistan ...any person who is born to their fathers will not support kashmiri stone Pelters ...nange doubt nin mele hahaha ..Kashmir belongs to indian nationalist ...bholo bharath mata ki jai ...no of unlikes shows this media is filled with pakis
Uri terror attack should be condemned and the wrong doers should be punished. But this brutal act did not happen all of a sudden. It was part of the two month long violence in Kashmir which killed nearly hundred people and injured thousands of innocent Kashmiris.
When you show solidarity with martyred soldiers, you should not forget the martyred Kashmiri civilians. Only terrorists deserve death. Civilians deserve your solidarity and those who are using pellet guns against innocent civilians deserve punishment.
United for a better Mangaluru now expanded jurisdiction till district borders? Or this is a new forum?
Lets join our hands together to support our armed forces that are protection our nation by sacrifying lives.
Btw, why caostaldigst.com did not cover yesterday's event at the same Kadri War Memorial wherein nationalist leaders paid tributes to the martyrs?
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