‘Adoption of 3 govt schools should be made mandatory for MLAs, MLCs in Karnataka’

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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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

Thiruvananthapuram, Apr 27: Kerala Chief Minister Pinarayi Vijayan on Sunday said the issue of return of Non-Resident Keralites (NRKs) to the state has been taken up with the Centre and the state government is awaiting a favourable response.

Vijayan said this in a meeting with Non-Resident Keralites over steps taken by the state government for those wishing to return to the state from foreign countries.

The Chief Minister announced that the Department of Non-Resident Keralites Affairs has opened online registration for such NRKs.

"Those returning should undergo screening at airports. All those returning should undergo mandatory home quarantine for 14 days.

Arrangements of isolation wards will be provided for those unable to go home," said Vijayan.

Mangaluru, May 30: Coastal district of Dakshina Kannada today recorded third covid-19 death as a 67-year-old woman from Bantwal taluk succumbed to the coronavirus at the district Wenlock Hospital, the designated Covid hospital.

The victim is said to be a neighbor of two women (daughter-in-law and mother-in-law) who died of the coronavirus a few days ago. 

On April 18 due to difficulties in breathing, she was rushed to Wenlock Hospital, where she was tested positive for coronavirus. Initially she responded to treatment. However, her condition started worsening earlier this week and breathed her last today evening.

Her daughter also has been tested positive for the deadly virus and she is currently undergoing treatment.