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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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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, Jan 2: India on Sunday reported the second case of novel coronavirus with a person from Kerala with a travel history to China testing positive, officials said.

"The patient has tested positive for novel coronavirus and is in isolation in a hospital," the health ministry said.

The patient is stable and is being closely monitored, it said.

India's first novel coronavirus case in India was also reported from Kerala with a student testing positive.

Bengaluru, Mar 23: Karnataka Home Minister Basavaraj Bommai had warned those who chose to defy the lockdown order clamped in nine districts, to prevent the spread of the dreaded COVID-19 virus in the state. 

Speaking to newsmen, he said, "We have ordered for a lockdown in nine districts in the state to prevent the spread of the coronavirus and issued guidelines to follow it."

The nine COVID-19-affected districts are Bengaluru, Bengaluru Rural, Mysuru, Kodagu, Dakshina Kannada (Mangaluru), Dharwad, Belagavi, Kalaburgi and Chikkablapur.

According to Mr. Bommai, the State government will put in place further measures next week depending on how the situation will unfold in the State and the neighbouring States.

"Government offices will be operational in the State, including in the nine COVID 19-affected districts. As per the current schedule, the legislature sessions will also continue. Pourakarmikas will be working at 50% strength," he added.