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Bengaluru, Jun 12: The Central government has identified Karnataka's Udupi and Yadgir among the "emerging districts of concern" for COVID-19 in the country. Confirming the development, a top official of the state health department said, "they (centre) had reviewed these two districts a few days back...there was a sudden spurt of cases due to Maharashtra returnees turning positive." Sources said union cabinet secretary Rajiv Gauba, during a recent video conference with state chief secretaries and health secretaries, had shared his thoughts on the issue.

According to the information shared, districts with more than 400 cases, half of which was reported post-May 18 lockdown relaxation, have been identified as "emerging districts of concern." They are concentrated in the seven states/union territories of Maharashtra, Rajasthan, Tamil Nadu, West Bengal, Karnataka, Jammu and Kashmir and Haryana. "Udupi and Yadgir from Karnataka, along with Gurugram in Haryana and Kolhapur in Maharashtra have 90 per cent of the cases recorded after May 18," they said.

As on June 11 evening, Udupi had a total of 969 positive cases, out of which 619 are active, while 735 positive cases have been reported in Yadgir, out of which 626 are active. The two districts had reported a total of only 11 cases each as on May 18. While Udupi till last evening had seen 349 discharges, it was 108 in Yadgir.

Both districts have reported one COVID related fatality so far. As of June 11 evening, cumulatively 6,245 COVID-19 positive cases were confirmed in the state, which included 72 deaths and 2,976 discharges.

Kalaburagi, Jun 16: Stones were pelted by villagers at an ambulance and a vehicle of health department at Tanda village here, which was fetching 15 people who had tested positive for COVID-19 to a hospital for treatment.

"A medical team along with some police personnel had gone to the Tanda village to bring 15 people who had tested positive for COVID-19 to a hospital for treatment on Monday," Lada Martin Marbaniang, Superintendent of Police (SP) Kalaburagi said.

"The medical team had an argument with villagers, which turned violent and those people started pelting stones at the ambulance and a vehicle of the health department," the SP said.

"On getting information, we rushed more security forces to the village. I visited the spot and spoke to a few leaders. Subsequently, we were able to convince them and all of them were brought to the hospital. A case has been registered against violent offenders," he added.

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