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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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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, Apr 8: The Karnataka government is in favour of lifting the coronavirus lockdown in districts which remained free of the virus infection, subject to approval from the Centre, Chief Minister B S Yediyurappa said on Wednesday.

In an interview to, he also said the state intended to relax liquor sales, stopped since the 21-day lockdown was imposed to contain the spread of COVID-19, after April 14 in a bid to increase state revenues.

The chief minister said the state's legislators would take a 30 per cent salary cut.

According to officials, there were no COVID-19 cases in 12 districts of the total 30 districts in the state.

As on Wednesday, there were 181 COVID-19 cases in the state, including 5 deaths and 28 discharges.

"If the Prime Minister suggests to states to take decision (on lock-down) based on the situation in their respective states, my position is to take a call (on roll-back) in districts free from COVID-19", Yediyurappa said.

This is to allow people to go about their business and move about within the district and not from one district to another, after April 14, after taking the approval of the Prime Minister, he said.

Mangaluru, Mar 28: Dakshina Kannada District observed a total shutdown on Saturday with closure of all shops, barring milk booths and pharmacy, to prevent spread of deadly Coronavirus.

The Central Market, a hub of activities where vegetables, groceries, flowers are sold, remained closed. Despite the milk booths and pharmacies being exempted from the purview of bandh, only a few milk booths remained open here.

The administration decided to go far bandh ion the wake of people failing to follow the lockdown guidelines of maintaining social distance and some wandering on the streets without valid reason. Moreover, there was increase in the number of corona cases despite measures taken, Deputy Commissioner Sindhu B Rupesh said.