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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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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just sentence him to death.. this kind of morons are evil for society. he was earning handsome salary of 40k+ riyals and braking against muslims/islam. if he work in india as engineer he wont get even10k indian rupees. whoever do this kind of hatred againt other religion whether muslim, hindu or christian he deserve death only.
Its every one's duty to respect the laws of the country where we live. Being expatriate in Saudi Arabia we should be more careful on the issue. You might be follower of enemies of islam in India, but you cannot do it in Saudi Arabia or Gulf countries. You mihgt have been brainwashed in india but anti national and anti muslim political parties, who are trying to make use of you to spread hate among different communities for their political benefit. At last you will be the one to suffer. No political for whom you are working will not come to support you and they will say you are not related to their party and there is no connection between you and the party. dont get fooled by these hate political parties. I am sorry for the fate of this unfortunate person and hope he will be freed at the earliest possible. This is good lesson for all hate mongers in Saudi Arabia. Dont bring your dirty politics to saudi arab ia. People from all religion are living peacefully here. They eat together and live together as one family.
Maron is arrested, let him learn his mistake for his hatrate,
indian political people make innocent people to reach and this is what the end result but the political people are living happly with all facility only ch**tya citizen of india is fooled all time.
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