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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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

Tumkur, Jan 10: A five-year-old boy has been killed by a leopard in Gubi taluk of Tumkuru district in Karnataka.

The local police said today that the incident took place on Thursday evening when the boy was returning home along with his grandmother.

The leopard first attacked a cow and then the boy who was behind it. The feline dragged the body into the forest.

After a search operation by the forest officials, the body was found and handed over to the parents after post-mortem.

Bengaluru, Jul 12: Karnataka on Sunday registered 71 COVID-19 deaths, its highest single day count, and 2,627 fresh cases, pushing the tally of infections in the state to 38,843, the health department said.

The total positive cases include 22,746 active cases and 15,409 discharges, the department said in its daily bulletin.

The total active cases include 532 people admitted in the ICUs across the state.

Of the 71 fatalities, a record 45 were reported in Bengaluru alone including the death of 16 day-old baby girl and 17-year-old girl with chronic kidney disease, taking the total mortalities in the city to 274.

Among the districts, where new cases were reported, Bengaluru urban accounted for 1,525 cases, followed by Dakshina Kannada with 196, Dharwad 129, Yadagiri 120, and 19 in Bengaluru Rural.

Since the outbreak of the pandemic, 8.39 lakh samples have been tested including 20,050 on Sunday alone, of which 7.80 lakh tested negative.

Other than Bengaluru, five fatalities were reported in Dakshina Kannada, three each in Mysuru, Hassan, Davangere and Belagavi, two each in Haveri and Bagalkote and one each in Dharwad, Koppal, Tumakuru, Vijayapura and Chamarajanagar.

While majority of those who died of coronavirus suffered from Severe Acute Respiratory Illness and Influenza Like Illness, significantly 21 victims did not have any pre-medical conditions while eight were the asymptomatic patients with pre-medical conditions.