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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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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anybody got their grevences answered here
corporation lights of cemetrey not glowing since two months. On 1st November 2019 is holy souls day. Kindly repair the lights at the earliest.
Fr. Joseph J. Lobo
Parish Priest
Street light is not working since 15 days. On 23rd July 2019 complaint lodged with Mobile No7353933410. Till date they are not responding
hello / madam
Keeping the city clean is our duty. I know not everybody is following that. We need some awareness program
to keep our city clean green and hygenic. Its our duty to keep the environment clean and place around us.
But it is also the duty of Corporation to maintain the cleanliness aroud the city, in some parts of the city like market, near clock tower circle its not been getting cleaned from past few days. Please do the needfull for betterment of tomorrow
thank you
Dear Madam, I have purchased 1 BHK flat in Green City, Vamadapadav on October, 2013 and paid full amount to builder T3 Urban Developers LTD. As per agreement possession was in December, 2015 but still building is not ready.
There were 5 buildings in Green City and at a time builder started 3 buildings construction work. I have purchased middle of the building and that building 1st floor slab only completed and since long time work stopped.
Last year builder agreed to give me flat in 1st building but building’s interior work is still pending and since 1 year work totally stopped.
Presently builder is not picking call or not responding for query. It seems that he is cheating with me. Kindly help me to resolve this issue. I will be grateful to you.
Sir/Madam,
Four street lights are not working on Raghavendra Matt Road, Hosabettu, Surathkal since long.
The roads are in Shabby condition and hence difficult in the night to Padastrians.
Kindly arrange to replace the treet lights on Main road, Raghavendra Matt Road, Hosabettu, near and after the Areca Field.
the kalbavi road in kottara ashok nagar was provided with ugd pipe line during last year. as usual the centre of road was dug up in march 2018 for this purpose making the road not motorable during the monsoon of 2018.
the asphalt work is now planned now during nov2018 by mcc. this road is very narrow and not having the foot path or road side drain at all.
both the ugd agency as well as the asphalting agency have put the muck/soil on the sides of the road, making it now impossible to walk when there is traffic. also during monsoons , storm water from the entire stretch for about 500 ft will flow on this road itself which is diverted to my compound/pure water sump due to the faulty work of mcc.
in spite of repeated requests/complaints to the commissioner,corporators, engineers of mcc, publishing of the photos of the same in some news papers,action is yet to be taken.
now at least it is requested to remove all the above dumped muck /soil on either sides of this road which is also preventing the entry of monsoon water th the existing drain near the starting point of sagar court.
Street light not working at kulai kavinakallu 2nd street
Relevant department has to look into the matter seriously and work on it and mark the matter as closed so that its notified as closed. Its a good move for public and public workers to work hand in hand
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