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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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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, April 5: Former Karnataka chief minister HD Kumaraswamy on Sunday challenged Prime Minister Narendra Modi to offer a "credible scientific and rational" explanation for his candle-lighting call and said he is giving "meaningless tasks" to an already exhausted population.

The JD(S) leader questioned if the Prime Minister asked the nation to observe a candle-light vigil on the eve of foundation day of BJP.

"Has the PM slyly asked the nation to observe a candle light vigil on the eve of foundation day of BJP? April 6 being its foundation day, what else can explain the choice of date & time for this event? I challenge the PM to offer a credible scientific and rational explanation," Kumaraswamy tweeted.

"The government is yet to provide PPEs for doctors and make test kits affordable for the common man. Without telling the nation what concrete steps are being taken to combat COVID-19 menace, the prime minister is giving meaningless tasks to an already exhausted population," he tweeted.

"It is shameful to convert the national crisis into an event of self aggrandizement & it is beyond shameful to push the hidden agenda of his party in the face of global calamity. May sense prevail upon the PM," the JDS leader said in another tweet.

Amid a nationwide COVID-19 lockdown, Prime Minister Modi on Friday appealed to countrymen to light diyas and candles on April 5 at 9 pm to fight the darkness spread by the pandemic. He asked the people to turn off all the lights in their homes and stand at doors or balconies and light candles or diyas, torches or mobile flashlights for 9 minutes on April 5.

Last month, PM Modi had asked the people to come out in their balconies and clap and beat utensils to show appreciation for doctors, nurses and others helping fight coronavirus on 'Janata Curfew'.

Mangaluru, Jul 2:  A seven-day old baby boy was tested positive for Covid-19, Health Department officials said on Thursday.

The infant is currently undergoing treatment at a designated Covid Hospital here. The baby was born at a private hospital in the city last week. 

According to the officials, it was not known as to how the newborn contracted the infection.