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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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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, Mar 23: Following the alarming increase in Coronavirus cases, Police Commissioner Bhaskar Rao on Monday said that those subjected to home quarantine stamping would be arrested if they were found to visit public places.

"5,000 Home quarantine stamping was carried to ensure that they remain in home and not to be seen in public places for their own interest as well as in an attempt to prevent spread of Coronavirus", he tweeted.

"I have received information on some of those stamped are moving in BMTC (Bengaluru Metropolitan Transport Corporation) buses and sitting in restaurants. Please call 100, these people will be picked up, arrested and sent to government quarantine," Rao said.

Mangaluru, Jun 2: Karnataka-Kerala border at Talapady is yet to be opened for traffic despite lifting lockdown. Only those, who have registered on ‘Seva Sindhu’ portal, are given one-time permission to enter the district.

With the relaxation of the lock-down many, especially the labour class, were anticipating free movement. However, both the States have not allowed free movement of vehicles. Hundreds of people from bordering villages of Kerala arrive in Mangaluru for work and likewise many from bordering villages of Mangaluru too work in Kasargod district.

It has become a routine for the labourers of both the States living in border villages to daily assemble at the check post in the morning and return after the authorities refuse free movement.