12 from Karnataka, who attended Tablighi Jamaat conference, test negative for COVID-19

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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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 15: Karnataka on Wednesday reported 3,176 new cases taking the total count of cases in the state to 47,253.

A total of 1,975 new cases were reported from the Bengaluru alone, the state's health department said.

The toll has gone up to 928 with 87 deaths reported today.

The total count of COVID-19 cases in the country is 9,36,181.

Mangaluru, Apr 26: In the wake of the fears among local people regarding the cremation of coronavirus victims, an understanding has been reached with all stakeholders that the Mangaluru city corporation's crematorium here will be the official funeral site for such cases in future.

Mangaluru South MLA D Vedavyas Kamath, who had to face stinging criticism on social media for his alleged support to local people who stopped the cremation of a COVID- 19 victim at Pachanady near here on Thursday, took an active role in finding the solution.

The body of the victim, a woman, had to be taken from Pachanady to Kaikunje during the night, delaying the funeral by hours.

Kamath visited Boloor on Saturday and sought to convince the people that cremating the bodies of coronavirus victims would not endanger their lives in any way as the guidelines of WHO and union health ministry are being strictly followed.

The crematorium at Boloor is run by the MCC and has an electric furnace and firewood pyres.

Kamath said a tacit understanding that final rites of COVID-19 patients inDakshina Kannada will be performed at Boloor has been reached at a meeting with all stakeholders.

Cremating bodies in such a controlled environment is deemed safe as per guidelines, he said.

City Mayor Diwakar, local corporator Jagadish Shetty and MCC assistant commissioner Madan Mohan took part in the meeting.

The decision was conveyed to the DK district administration.

The district administration has also launched a campaign on dead body management protocol to convince the people to ignore misinformation being spread regarding the cremation of coronavirus victims.