Hindus urged to accommodate sants, sadhus during Udupi Dharma Sansad

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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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, Jul 11: Karnataka on Saturday reported the biggest single-day spurt of 2,798 cases and a record 70 related fatalities, taking the total number of infections in the state to 36,216, the health department said.

The day also saw a record 880 patients getting discharged after recovery.

Out of 2,798 fresh cases, a whopping 1,533 cases were from Bengaluru urban alone.

The previous biggest single-day spike was recorded on July 10 with 2,313 cases.

As of July 11 evening, cumulatively 36,216 COVID-19 cases have been confirmed in the state, which includes 613 deaths and 14,716 discharges, the health department said in its bulletin.

It said out of 20,883 active cases, 20,379 patients are in isolation at designated hospitals and are stable, while 504 are in ICU.

Out of 70 deaths reported, 23 are from Bengaluru urban, 8 from Mysuru, five from Dakshina Kannada, among others.

Most of the dead are either with a history of Severe Acute Respiratory Infection (SARI) or Influenza-like illness (ILI).

Out of 2,798 cases tested positive today, contacts of the majority of the cases are still under tracing.

Among the districts where the new cases were reported, Bengaluru urban accounts for 1533 cases, followed by Dakshina Kannada 186, Udupi 90, Mysuru 83, Tumakuru 78, Dharwad 77 and Yadgir 74.

Bengaluru urban district tops the list of positive cases, with a total of 16,862 infections, followed by DakshinaKannada 2,026 and Kalaburagi 2,024.

A total of 7.99 lakh samples were tested so far, out of which 20,587 were tested on Saturday alone.

So far 7.46 lakh samples have been reported as negative, and out of them 17,488 were reported negative today.