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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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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 28: Karnataka Deputy Chief Minister Govind Karjol on Ssturday said the coronavirus epidemic has reached the third phase and cautioned people defying the lockdown orders.

"Today the coronavirus epidemic has entered the third phase. By and large people are cooperating," he told reporters at Bagalkote.

The deputy chief minister said there were some people defying the lockdown orders by roaming in groups without wearing masks.

He said he has directed the district authorities to take stringent action against them.

Karjol also said the government has taken adequate measures for the treatment and prevention of this disease.

Steps have been taken for door-to-door supply of grocery items in Bagalkote, he added.

Bengaluru, Apr 10: Karnataka Chief Minister B S Yediyurappa, expressing his concern over the plight of stray animals struggling during lockdown, called upon people to feed the animals near their houses and provide them drinking water.

In a tweet he said "Due to scorching heat and Lockdown, cats, dogs and birds are suffering without water and food. In cities this situation much serious. So I appeal to people that people should see that dogs and birds their get food and water.

Please be kind and take some time off to feed stray animals and birds around your homes. Try providing them with water and leftovers so they're not parched and left hungry. Stray animals depend on wastes and leftovers from hotels and restaurants and have been hit by the Lockdown to check the spread of Corona virus.