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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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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 25: Karnataka Minister Dr K Sudhakar has been allocated all matters related to COVID-19 by the Governor on the advice of Chief Minister BS Yediyurappa.
Health Minister B Sriramulu, who earlier handled matters related to COVID-19, has been allotted the Backward Class Welfare Development portfolio.
Karnataka on Monday announced a complete lockdown in the state till April 1.
"In the wake of the coronavirus outbreak, the entire state will be locked down from 12 o'clock night of March 23 to April 1. People are requested to strictly follow it to contain the coronavirus spread," Yediyurappa had said.

Kasaragod, Mar 23: With 19 more positive cases reported on Monday, surveillance against people coming out of their houses and wandering around in public places has been intensified in the district.

With today's addition, the total number of positive cases of Novel Coronavirus (COVID-19) has increased to 38 in Kasaragod.

There will be total restriction in place for the public to step out of their houses. Those who are found outside on the streets would be arrested, caution the district authorities. Please log in to get detailed story.