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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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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

Mangaluru, May 6: The Kanara Chamber of Commerce and Industry has urged the government to consider erstwhile undivided Dakshina Kannada (now DK & Udupi) as one unit for the purpose of movement of people. KCCI president Isaac Vas has written a letter to Karnataka chief secretary T M Vijay Bhaskar in this regard. 

Mr Vas said: Even though the erstwhile Dakshina Kannada district was bifurcated in 1997 for administration purposes, the two districts are actually an urban agglomeration with most of the population residing in suburbs/towns. Office Staff, technical crew and labour of many industries reside in either district and commute daily for work within an efficient transport system.

The present restriction on Inter-district movement in view of the Lockdown is hindering the kick starting of industries and commerce. Workers are deprived of their livelihood and Industry and business owners are finding it challenging to move forward. To add to this, the migrant labour is moving back to their native places further aggravating the situation. Many Industries and Commercial establishments have requested us to take up this matter with the government, he said.

“Hence, we kindly request you to consider these two districts as one geographical area for the movement of people and private vehicles,” he said adding that this would facilitate movement of people for employment and business in either districts of Dakshina Kannada & Udupi.

He pointed out that Bangalore Rural, Bangalore Urban, Ramanagara, Chikkaballapur and Kolar are considered as a single unit as per your order No. RD158/TNR 2020 dt 03/05/2020 (Clause 2(a)).

Mangaluru, Apr 1: Dakshina Kannada District in-charge minister Kota Srinivas Poojary on Tuesday announced that essential shops including grocery stores, fruits and vegetable shops will be allowed to open from Wednesday between 0700 hrs to 1200 hrs across the district.

Speaking at a press conference, he said that Milk, Medical, Gas distribution, Petrol Bunks, Banks will be opened as usual, he informed adding that Central Market and the Suratkal Market will remain closed.

With the Dakshin Kannada district administration relaxing the lockdown from 0600 hrs to 1500 hrs to purchase essential commodities, panic-stricken citizens rushed to the shops early in the morning itself.