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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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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The biggest weapon of RSS is spreading lies and hatred. Who can stop that N Bomb?
Oh this big mouth minister from Left, I being a person from Kerala really know truth. CPIM uses their offices and politcians house to store arms. CM Vijayan and this fellow wanted to have special darshan tickets in Sabarimala and when it was shot down.... all this stories
Raid all mosques, churches and temples and check for arms
Bamboo Sticks/ Lathis are not Weapons. Donot get Bogged down. They cannot use weapons to hurt. They just open their mouth and shout
Time for Hindus to take back Kerala and Kashmir.
Chief Minister should order police raids on these arm stores and recover the arms, and install CCTV cameras to monitor the activities round the clock. CM needs to substantiate his allegations with proof. I fully agree with his view that no religious ceremony should take place during any official function, it has no place in secular democracy. Our constitution gives every citizen right to practice religion of his or her choice freely but not at state level. State has no religion.
Here is a Minister for Temples Administration. He defines a temple as a centre for traditions and beliefs. Sorry Comrade , a temple is a place for worship of God. If it is only a place of tradition and faith, there is the danger of it being appropriated by the communist Party, which has both tradition and faith. No temple in Kerala will allow storing of weapons within, may be in its offices or quarters of staff. Is it a plan for the commies to violate the sanctity of the temples?
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