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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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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, Jun 8: More than two months after the nationwide lockdown was imposed to curb the spread of coronavirus, people offered prayers at Bengaluru's Saint Mary's Church and Shree Dodda Ganapathi Temple as the government has allowed reopening of religious places from today.

Fewer devotees here visited Saint Mary's Church in Shivaji Nagar and were seen maintaining social distancing inside the church premises.

Meanwhile, people queued outside Shree Dodda Ganapathi Temple at Basavanagudi to offer prayers in the wee hours of Monday.

Floor markings have been made here to maintain social distancing.

Social distancing norms are also being followed in Hubli's Nagashetty Koppa where only a few devotees thronged the temple on Monday morning.

In Kalaburagi's Sharana Basaveshwara Temple the visiting hours for devotees have been fixed from 7 am to 10 am and three hours in the evening from 5 pm to 8 pm.

Thermal screening is being conducted here and a disinfectant tunnel has also been installed at the entry point.

Floor markings have also been made here to ensure social distancing while barricades have also been installed on the temple premises.

Bengaluru, Jun 2:  With easing of COVID-19 lockdown curbs, the Karnataka excise department has accorded permission for fresh brewing or production of beer and to sell it in microbreweries as takeaways.

"Permission is hereby accorded to microbreweries for fresh brewing/production and sale of beer as takeaway in glass, ceramic or stainless steel container (up to 2 litre) till 30-06-2020, or until further orders, whichever is earlier," the Excise Commissioner in a letter dated June 1 to Deputy Excise Commissioners of all districts said.

The opening and closing hours of the microbreweries shall be from 9 am to 9 pm, it said, adding that all other conditions as laid down will remain unaltered.

Earlier, in a letter dated May 12, the Excise Commissioner had "conditionally" granted permission for microbreweries to sell their beer stock as takeaway on experimental basis for the period from May 14 to June 30 or until exhaustion of existing beer stock, whichever is earlier.

It had called for measures like social distancing, cleanliness, usage of masks and sanitizers, among others, and had said, microbreweries situated in containment zones are not allowed to function.