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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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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 14: Despite lockdown in the country to contain the spread of coronavirus, former chief minister of Karnataka and Janata Dal-Secular leader, HD Kumaraswamy has decided to go ahead with marriage of his son Nikhil.

"Marriage will be performed in closed doors among the family members, which may be around 50 people. Family members only will be present in the marriage and all the precautionary measures will be followed as per the guidelines given by the government," Kumaraswamy said.

Nikhil Kumaraswamy, who contested Lok Sabha election from Mandya, is also the national youth wing president of Janata Dal-Secular. His marriage has been fixed with niece of former Congress minister M Krishnappa on April 17.

"Date was fixed months ago and we canot miss the good star and holy muhurtham. That is why we have decided to perform marriage on the fixed date among the family members," he said.
Marriage will be performed at bride Revati's residence.

Earlier Kumaraswamy and family had plans to perform the marriage at a location near Ramnagar, which is also former chief minister's constituency.

Mangaluru, Mar 25 : Taking into account surge of COVID-19  cases in neighbouring districts, Dakshina Kannada district administration has decided to suspend retail sales at Central Market in Mangaluru and public will not be allowed to purchase at Central Market from Thursday.

Proper arrangements have been made for the public to buy from nearby grocery shops from 6 am till 12 noon. 
However strict social distancing has to be ensured by the vendors failing which action will be taken, warned Deputy Commissioner Sindhu B Rupesh. The public are advised to follow social distancing measures.