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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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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: Karnataka Chief Minister BS Yediyurappa on Tuesday welcomed Prime Minister Narendra Modi's decision to extend COVID-19 lockdown till May 3.

"Our government will strictly implement the Government of India guidelines, which will be issued tomorrow. Lockdown will be followed more stringently till April 20 as Prime Minister said and the situation will be closely monitored. I appeal to the people of Karnataka to voluntarily cooperate with us to contain this disease," Yediyurappa said.

The chief minister urged the people to respect seven major points that Prime Minister Modi raised in his televised address to the nation on Tuesday, while announcing the extension of coronavirus-induced lockdown.

"I appeal to people to follow the seven measures Prime Minister advised to follow, such as taking care of elders in the house especially those suffering from chronicle illness; strictly maintaining social distancing; enhancing immunity by following guidelines of Ayush Department; download Arogyasetu app; help the poor and needy; to be considerate about your colleagues and employees and not to sack them; and respect the police, healthcare professionals," Yediyurappa added.

The chief minister also assured that there is no scarcity of medicines, essential services and goods.

"We will make all efforts to carry out agriculture activities without any hurdle. I make a special appeal to migrant labours to stay wherever they are and be safe... Stay home and be safe," he said.

According to the Union Ministry of Health and Family Welfare, there are 247 COVID-19 positive cases in Karnataka including 59 cured, discharged, migrated and six deaths.