Tagore's Day' celebrated at St Aloysius College

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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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, Apr 10: With 10 new COVID-19 cases, Karnataka's tally of coronavirus cases has climbed to 207, the Karnataka government has said.

The 207 COVID-19 cases include 30 discharged and 6 deaths. Out of 10 new cases, 9 are close contacts of people who had earlier tested positive for coronavirus.

"10 more COVID-19 positive cases reported in Karnataka, taking the total number of positive cases in the state to 207, including 6 deaths and 30 discharged. 9 of the 10 new cases, are close contacts of people who had tested positive for the virus earlier," said the Karnataka government.

Meanwhile, the State Department of Health and Family Welfare has further notified 14 more COVID-19 dedicated hospitals in the state.

These hospitals include Bagalkot District Hospital, Chamarajanagar Institute of Medical Sciences, District Hospital Chikkaballapur, SNR District Hospital, Kandaya Bhavan Ramanagar, Tumkur District Hospital, Karwar Institute of Medical Sciences Uttara Kannada, Vijayapura District Hospital and Yadgiri District Hospital.

India's total number of coronavirus positive cases rose to 6,412 on Friday.

Out of the total cases, 5,709 are active patients and 503 of them have been cured/discharged, as per the Ministry of Health and Family Welfare.

With 30 new deaths reported in the last 12 hours, the toll stands at 199.

Tumakuru, Apr 12: Fearing the spread of COVID-19 in Muddenahalli village, the villagers shifted to living in tents in nearby fields with most of their belongings.

Kariyappa, one of the villagers said, "We were scared of the COVID-19 spread, so we came here."

Around 60 families of the village lived in tents for three days, before they returned to their houses on the advice of the Tehsildar.

So far, 214 COVID-19 cases, including six deaths, have been reported in the state of Karnataka.

With 34 deaths and 909 new positive COVID-19 cases in the last 24 hours, the total number of coronavirus cases in India on Sunday reached 8356, including 716 cured and discharged, according to the Ministry of Health and Family Welfare.