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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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

Bengaluru, Mar 30: The nationwide lockdown has left the state on the brink of a fresh agrarian crisis.

The lack of transport facilities spells doom for ready-to-harvest grapes worth Rs 500-600 crore in Bengaluru Rural, Chikkaballapur and Kolar districts. Unable to find buyers, several farmers have begun dumping their produce into compost pits.

On Sunday, Munishamappa, a farmer in Chikkaballapur, emptied four truckloads of grapes into the pit as buyers didn’t turn up due to the lockdown. “If the grapes wither and fall to the ground, it will affect the soil’s fertility and I will be forced to dispose of them,” he said.

Venkata Krishnappa, Munishamappa’s son, said their 1.5-acre vineyard yielded 25 tonnes of grapes. “Just before the lockdown, 10 tonnes were harvested and delivered to the market. Due to lack of transport, buyers haven’t turned up for the remaining 15 tonnes which we are dumping into the pit.”

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Anjaneya Reddy, a farmer leader, said that in Chikkaballapur alone, they have cultivated grapes on 2,000 acres. “Even if you consider 15 tonnes per acre as yield, there are about 30,000 tonnes ready to be harvested in the district. At a market rate of Rs 50 to Rs 60 per kilogram, the net worth will be Rs 200 crore to Rs 300 crore. And if you consider the crop in Kolar and Bengaluru Rural, grapes worth Rs 500 to Rs 600 crore are at stake,” he explained.

The ‘Dilkush’ grapes is the most preferred variety of domestic consumption, according to the farmers.

This apart, farmers would have invested about Rs 3 lakh to 4 lakh per acre on fertilisers, pesticide and labour. “With markets being shut and no of the transport facilities available, farmers are forced to dump their produce into pits. It is high time the government intervened and provided us with market options so that farmers can sell at an affordable price of Rs 30 to 40,” Reddy said.

Somu, a farmer in Ganjam village of Srirangapattana, dumped two tonnes of chikku (sapota) citing market shutdown in Mandya. Reddy appealed to the government to emulate the Maharashtra model where the government is helping farmers market fruits through Hopcoms or dairy units as nutrient supplements to people.