Santosh Hegde, Padmaraja Dandavati, 11 others conferred Nudisiri Awards

Bengaluru, Jul 20: Karnataka on Monday reported 3,648 COVID-19 cases taking the tally to 67,420, informed the state health department.

According to a bulletin issued by the department, the state recorded 72 more deaths due to COVID-19 with the toll at 1,403 while six patients who tested positive for the infection have died due to non-COVID causes, as of Monday.

There are 42,216 active cases in the state.
As many as 730 patients were discharged today, taking the total discharged patients to 23,795.
Bengaluru recorded the highest number of cases and deaths today at 1,452 and 31, respectively, informed the state health department.

India's COVID-19 case tally crossed the 11-lakh mark with the highest single-day spike of 40,425 new cases and 681 deaths reported in the last 24 hours, said the Union Health and Family Welfare Ministry on Monday.

The total cases in the country now stand at 1,118,043 while the death toll is 27,497.

The ministry said the total number of cases include 390,459 active cases and 700,087 cured/discharged/migrated.

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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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