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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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

Kasaragod, May 25: An autorickshaw driver from Belur in Kasaragod was admitted for surgery to a hospital after being hit on the head by a falling jackfruit. He was tested positive for the coronavirus. It is not clear how he contracted the viral infection.

“While he was trying to pluck a jackfruit off a tree, one of them fell on him, injuring his spine. His hands and legs were weakened too. His condition required surgery. Our protocol dictates that we subject everyone who require immediate surgery to the covid test, just to be sure. That’s when he tested positive,” said Dr K Sudeep, superintendent of the Pariyaram Medical College in Kannur.

“He had symptoms of Covid-19. But he has no recent travel history or contact with any infected person. We’re not sure if he got it through one of his passengers in the rickshaw. He had visited the district hospital once so he could have got it from there. Anyway, we are examining it and preparing the route maps,” he added.

His family will be quarantined and health workers have begun to trace his immediate primary contacts.

Though there have been a number of cases in Kerala where a person’s source of infection could not be correctly ascertained, such people have gone on to recover without spreading the infection to others.

The Kerala government is conducting testing of high-risk persons on the frontlines, such as police officials, grocery vendors and health workers, as part of its sentinel surveillance programme, but maintains that there’s little evidence of a community spread in the state.