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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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

Udupi, May 18: As many as eight fresh coronavirus positive cases have been reported in coastal districts of Udupi and Uttara Kannada. 

No fresh positive case was reported in Dakshina Kannada since yesterday.

According to Health and Family Welfare Department, two men aged 38 and 24 years, an 8-year-old boy and a 24-year-old woman tested positive for coronavirus in Udupi district today. 

All of them were under quarantine after returning from Maharashtra recently. They were shifted to covid-19 hospital for treatment. With this the number of covid-19 positive cases in Udupi district mounted to 15.

Meanwhile, Uttara Kannada district also received a jolt with four more cases. Yesterday it had reported eight cases.

Bengaluru, Apr 14: The Karnataka government has decided to adopt “remote monitoring” of COVID-19 positive patients in order to ensure the safety of healthcare professionals - the frontline warriors against the pandemic.

Two doctors treating COVID-19 patients tested positive recently and in to check such instances in future, the Department of Medical Education is planning remote monitoring, which reduces doctors’ exposure to patients.

Medical Education Minister Dr K Sudhakar has consulted some of the doctors in the United States who are already using this technology to treat the COVID-19 positive cases. The minister is also having a meeting with representatives of some of the companies which provide such technology.

“I spoke to a team of epidemiologists and heads of certain departments at the United States to know about the remote monitoring technology they are using. I am also meeting the representatives of a few such companies which can provide us with the technology at our hospitals,”  Dr Sudhakar said.

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The minister added, “We have heard reports of many doctors and other health professionals succumbing to COVID-19. We don’t want to take risk.” Explaining the technology, Dr Sachidanand, Vice Chancellor of Rajiv Gandhi University of Health Sciences said that remote monitoring uses a software with which specialist doctors can monitor health condition of patients and treat them by not getting exposed directly.

The presence of all the doctors in COVID-19 is not necessary when patients are monitored remotely.