PVR expands presence in Karnataka, opens 15 new properties

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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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 22: An elderly cardiac patient from Dakshina Kannada, who was stranded in Saudi Arabia due to covid-19 lock-down, has finally reached his homeland thanks to the timely intervention by Humanity Forum Jubail and Indian Social Forum.

The elderly man hailing from Kadaba area of Dakshina Kannada was admitted to a hospital in Madinah. However, his condition continued to worsen due to lack of proper treatment. The efforts by his family members to bring him back home had not yielded results.

Meanwhile, one of the relatives of the patient, Ansari Suratkal, who happens to be a DKSC activist, brought the issue to the notice of the Karnataka unit of the Indian Social Forum in Dammam. ISF contacted Humanity Forum president Zakariya Jokatte, who helped the patient to speak directly union minister D V Sadananda Gowda in a video conference organised by coastaldigest.com.

Humanity Forum also persuaded the Indian Embassy to allow the stranded cardiac patient to fly back to India through Dammam-Bengaluru repatriation flight on May 20. 

However, it was not easy for the patient to travel from Madinah to Dammam International Airport due to lock-down and curfew. ISF not only obtained travel permission for him but also arranged vehicle. Jeddah and Riyadh units of ISF helped in obtaining permission letter in their respective places in spite of travel ban imposed by the police. Madinah unit of ISF arranged vehicle for transportation. Zakariya Jokatte bore the air ticket and other expenses of the patient.