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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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

New Delhi, Mar 24: Prime Minister Narendra Modi on Tuesday announced total lockdown in the country from 120'clock tonight in a bid to contain the spread of coronavirus.

"From 120'clock tonight there will be a complete lockdown across the country,"said Prime Minister Modi said during his second address to the nation within days.

He also hailed the people for the success of 'Janata Curfew' saying that they showed how Indians can come together and fight against any trouble which comes before the country.

"The one-day Janta Curfew showed how we Indians come together and fight against any trouble which comes before the country and the mankind,"he added. (ANI)

Bengaluru, Mar 25: Bengaluru Police Commissioner Bhaskar Rao on Wednesday called a meeting of online, e-commerce food, medicine, groceries or animal products delivery aggregators at his office in wake of situation arising out of lockdown imposed in the entire country due to coronavirus epidemic.

The Police Commissioner has appealed one representative from each agency to join him in the meeting at 7 pm.

"I have called a meeting of online, e-commerce food, medicine, groceries, vegetables/fruits or animal products delivery aggregators today at 7 pm at my office at Infantry Road, Bengaluru," said Rao.

"One representative from each agency may please come. We promise all cooperation, please come," he said.
The Indian Council of Medical Research (ICMR) on Wednesday confirmed 539 positive cases of coronavirus in the country.

Prime Minister Narendra Modi had on Tuesday announced a 21-day lockdown in the entire country effective from midnight to deal with the spread of coronavirus, saying that "social distancing" is the only option to deal with the disease, which spreads rapidly.