Nisar Ahmed, Cham Pa, eight others to get 'Alva's Nudisiri Award–2011'

Mangaluru, Apr 22: City Police Commissioner Dr P S Harsha, on Wednesday, interacted with families of Covid-19 warriors of the Police Department through a special video conference to infuse confidence in them.

He spoke to the family members of the police personnel who, along with ASHA workers, are monitoring the home quarantined people and even assist them in supplying essentials and medicines.

Most of the family member of the police personnel were of North Karnataka origin and the Commissioner asked them to stay safe by staying at home and explained to them the good work done by their family members in the Police Department.

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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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, Jun 7: Fatalities due to coronavirus reached 61 in Karnataka with two more deaths, while 239 more tested positive for the viral infection, pushing the tally in the state to 5,452, the health department said on Sunday.

The total COVID-19 cases in the state include 2,132 discharges, 3,257 active cases and 61 deaths. A 61-year-old woman suffering from hypothyroidism and was diagnosed with Severe Acute Respiratory Illness (SARI) died on Saturday whereas a 57-year-old man having filariasis and chronic nyeloid leukemia died on Sunday in Bengaluru.

Most of those who contributed for Sunday's new cases were interstate passengers. 183 passengers, most of whom returned from Maharashtra were tested positive for the virus, the health bulletin said.

According to the health department, 39 coronavirus positive cases were reported in Kalaburagi and Yadagiri, 38 in Belagavi, 23 in Bengaluru urban, 17 each in Dakshina Kannada and Davangere, 13 in Udupi, 12 in Shivamogga, nine in Vijayapura, seven in Bidar, six in Ballari, five each in Bengaluru Rural and Hassan, three in Dharwad, two each in Gadag and Uttara Kannada and one each in Mandya and Raichur.

India today reported the highest single-day spike of 9,971 new Covid-19 cases and 287 deaths in the last 24 hours, taking the total number of cases in the country to 2,46,628

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