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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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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All Muslim must Vote for SDPI...we should follow our hindu ppl...how they VOTE only for BJP in mangalore ...if the cadidate is also DOG..if it is hindu then they will vote for it....in similerly we should vote for SDPI if the cadidate is CAT....vote for religion not for this country development...
D'Souza Gaddar man...what is the construbution of your community towards indian independence...you people are slave and licking boots of british...we and our hindu brother fought & die to this country...
the biggest terror is the george W bush
we all know about you people...you always spread division, curription on earth and make people fight and play innocent role...
killing people using modern weapon & black suit with tie doest not make innocent..its also terror attack..
ALL Muslim must VOTE for SDPI, we all know the capacity of congress leader...NAMARD cadidate....if we defeat also we should vote for SDPI....
from where do you get all these infos ? Pls list out the outfit names also so that we can laugh out loudly.its an open challenge for you , prove your allegations if you dare
Wow Kudos to CD team for appraove OP's opinion. Kindly ensure similair opinion about national parties will be reflected as well. Journalism must be people friendly and request CD Editor team not to biased and respected readers opinion. Thanks
SDPI ZINDABAD............ YES LET CONGRESS SUPPORT SDPI IF THEY R REALLY A SECULAR PARTY........
SDPI is political arm of PFI, which allegedly has links with several terror outfits. All those who vote for this fellow are terrorists.
Let Congress – if it is really a secular party – decide not to field candidate from Dakshina Kannada and officially support SDPI as the latter had done in many seats in last Assembly polls. All the shortlisted Cong ticket aspirants are useless, shameless and corrupt people. Let all the peace lovers back SDPI this time.
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