Provide proof or stop baseless allegations: U T Khader tells Shobha Karandlaje

Mysuru, Feb 29: Tension prevailed at Tandavaput Industrial Area in Nanjangud taluk, Mysuru when a paper factory received a bomb threat call, which later turned out to be a hoax call.

The police said that the authorities of Rajshil Papers received a bomb threat call in the morning. After getting the information, the bomb detection squad rushed to the spot and inspected the factory premises and declared that it was a hoax call.

According to the police, an unidentified person called from his mobile, which is now switched off.

Gadag, Apr 9: An 80-year-old woman who tested positive for COVID-19 passed away on Thursday due to cardiac arrest in Gadag, the district's Deputy Commissioner said.

She also had a history of Severe Acute Respiratory Infection (SARI). Her body was disposed of as per the protocol, officials said.

According to the Karnataka Government, 10 new positive cases have been reported in the State today, taking the total COVID-19 cases to 191, including 28 discharged patients and six deaths.

With an increase of 540 positive COVID-19 cases reported in the last 24 hours, India's tally of coronavirus cases has risen to 5,734, said the Ministry of Health and Family Welfare on Thursday.

Out of the 5,734 cases, 5,095 are active COVID-19 cases and 472 patients have recovered while 166 have died.

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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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