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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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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, May 14: As many as 22 new cases have been reported in Karnataka taking the total number of positive cases in the state to 981. 

The new cases include five in Bengaluru Urban - all with a contact history, four each in Gadag - with history of travel to Ahemadabad, Mandya with travel history to Mumbai, Maharashtra and Bidar - with three from containment zone and one with travel history to Mumbai, three from Davangere and one each from Belagavi and Bagalkote.

Meanwhile, two more deaths have been reported in the state on Thursday morning taking the total toll to 35. This is apart from a non-COVID-19 death.

An 80-year-old resident of Dakshina Kannada, got admitted at private hospital following a stroke. She was shifted to the icu on confirmation for Covid-19 at a designated hospital on April 26. She died on Thursday due to septic shock.

Another 60-year-old male, resident of Ananthapur in Andhra Pradesh, admitted at Victoria Hospital in Bengaluru with severe pneumonia and respiratory distress died due to cardiac arrest on Thursday morning. He had hypotension and Diabetes Mellitus, according to the morning health bulletin.

Sources in Victoria Hospital said this person was the first patient to undergo clinical trial for plasma therapy. He was infused plasma on Monday. However, his condition continued to remain the same.