Congress will convince SDPI to withdraw nomination but BJP will retain DK: Kateel

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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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

Mangaluru, May 29: Several non-resident Kannadigas from various Gulf countries including Kingdom of Saudi Arabia on Thursday, May 28, interacted with Dakshina Kannada MP Nalin Kumar Kateel through a video conference and urged him to allow the Kannadigas stranded in the Middle East to return by facilitating the operation of repatriation flights.

The development comes amidst reports that lack of preparedness on parts of the local authorities in Karnataka compelling the Centre to delay the operation of flights from Middle East to Mangaluru and Bengaluru airports.

“We have never forgotten you. We will take necessary steps for your safe return to the homeland as soon as possible,” assured Mr Kateel after paying heed to the complaints of non-resident Kannadigas.

The video conference was organised by Ravi Shetty, ex president of Kannada Sangha Qatar.

Praveen Kumar Shetty, president, Karnataka NRI Forum of UAE, Sarvottam Shetty of UAE Karnataka Sangha, Avikshit Rai, Ravi Shetty, former president of Qatar Kannada Sangha, Santosh Shetty of Riyadh Karnataka NRI Forum, Zakariya Jokatte, president of Dammam Karnataka NRI Forum, Mohammad Mansoor, president of Bahrain Indian Overseas Congress, NS Shetty Kuwait, Pradeep Shetty of Kannada Sangha Bahrain, Karunakar Rao, Shashidhar Shetty Oman, Rajesh of Kuwait Kannada Sangha, Ramesh Bhandari, M E Muloor and Sunil Kulkarni among others participated in the video conference.