Youths should gain knowledge of history: Dinesh Amin Mattu

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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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, Ma 9: Three more persons from Bantwal taluk in Dakshina Kannada district tested positive for Covid-19 today. All three are members of a family.

The infection is reportedly linked to First Neuro Hospital of Mangaluru, which has emerged as a coronavirus hub in coastal Karnataka.

With this, the total number of coronavirus cases in the district mounted to 31 including six outsiders. Three of them have lost their lives. Currently there are 15 active cases in the district.

The newly identified coronavirus patients are a 30-year-old man and two elderly women aged 60 and 70 years.

They have contracted the infection from a 69-year-old man from Bantwal who was confirmed with COVID-19 infection on May 1. All the three members now infected belong to his family.

The man had got the infection from a woman identified as P-390. He happens to be a relative and neighbour of the deceased woman who belonged to Bantwal Kasaba village. Eight  members of his family were quarantined, of whom three tested positive today.

Bengaluru, Feb 9: The Karnataka Health and Family Welfare Services Department has kept 138 persons across the state under observation in the wake of novel coronavirus (nCov) scare, a health official said on Saturday.

"We are observing 138 people across the state, including in Bengaluru," the department's Communicable Diseases Wing Joint Director Prakash Kumar told news agency.

Though no coronavirus-positive case has been reported from Karnataka so far, four persons have been admitted in a state hospital under medical observation, Kumar confirmed.

Of the 104 samples sent for testing from the state, 85 have, so far, been declared negative. As many as 130 persons in the state were kept under home-isolation observation.

Four Karnataka districts bordering Kerala — Kodagu, Mangluru, Chamarajanagar and Mysuru — continue to be under surveillance after three positive coronavirus cases were reported in Kerala.

On Saturday, it was reported that three persons from Udupi were isolated at the Ajjarkad Government Hospital. Two of them had travelled to China while the other had returned to Udupi from Japan.

From January 20 till Saturday, 14,153 passengers underwent thermal screening at the Kempegowda International Airport, including three who had a history of visiting China’s Wuhan, the epicenter of the nCoV outbreak.

The '104 Arogya Sahayavani' call centre, which people can call for guidance on coronavirus, has clocked 1,792 calls so far.

"In case people with recent travel history to China and other affected countries develop any symptoms, they are requested to call 104 or health authorities and provide all necessary details in order to take necessary measures and are requested to be quarantined at home," reiterated the department.

Three confirmed cases of coronavirus were earlier reported in Kerala and over 722 deaths were confirmed around the world, mostly in mainland China.