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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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

Mangaluru, June 28: Three fresh deaths in last 24 hours have taken the total number of covid-19 deaths in Dakshina Kannada district to 13.

While a 31-year-old youth from Idya in Surathkal and a 57-year-old woman from Bantwal passed away last night, a 52-year-old woman from Jokatte breathed her last today. 

The youth from Suratkal breathed his last in Wenlok. The woman from Bantwal’s Loretto Padav village was unwell for last 1 year. She was tested positive three days ago and passed away at a private hospital. 

The woman from Jokatte was reportedly suffering from tuberculosis. On June 26, she was admitted to a private hospital in the city, where she was tested coronavirus positive.

As per the district health bulletin on Saturday June 27 evening, a total of 12,919 samples have been sent for tests till date, out of which 12,198 have turned out negative, and 576 positive, including 10 persons from other districts. 

Out of these, 148 are currently active. As many as 416 persons have recovered and been discharged.

Bangalore, Feb 1: Following the Directions from department of Health and Family Welfare, Govt of Karnataka, to set up Isolation ward for the admission and treatment of the Novel Coronavirus infected patients, Fortis Hospital, Bangalore has allocated 5 isolation beds, 4 at its Bannergatta unit and 1 at Cunningham Road Unit.

According to a statement issued here on Friday, Dr A Nagasubramaniam, Medical Director, Fortis BG unit said, “We are following the guidelines and protocols as suggested by Department of Health and family welfare and Rajiv Gandhi Institute of Chest Diseases in line with WHO guidelines for managing any suspected case. We will accordingly notify the health authorities.”

The management has been educating the hospital staff members, visitors and patients about the virus and the precautionary measures on a timely basis. A health advisory on Coronavirus has also been put up at the lobby and the canteen to educate the patient attenders, nurses and staff members, the statement added.