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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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

Hassan, Mar 14: Karnataka Health Department officials took help of the Police to get a man, who returned from pilgrimage to Mecca (Saudi Arabia), admitted to hospital as he refused to undergo clinical tests for suspected Coronavirus, official sources said on Saturday.

According to the sources, a family from Arkalgud taluk, who was on a pilgrimage to Mecca and Madina, returned on March 5 and the woman from the family developed fever and symptoms of flu.

On Friday evening, in view of the Coronavirus scare, a team of Health Department officials visited their house and directed them to get admitted to a hospital in Hassan for treatment.

Mangaluru, May 2: Ibrahim Musliyar Bekal, a prominent Muslim religeous leader in coastal Karnataka has urged the Dakshina Kannada district administration not to end the covid-19 lockdown before the end of the blessed month of Ramadan. 

The appeal comes in the wake of reports that the state government may allow opening of clothe shops during the month of Ramadan to felicitate Muslims for Eid shopping.

"Muslims in the district have completely cooperated with the district administration in making the lockdown sucessfull. They have refrained from going to mosque even for Juma and Taraveeh during Ramadan. Such a lockdown is necessary to contain the pandemic," said Musliyar, who is also the Khazi of Udupi and Chikkamagaluru.

If the district administration withdraws lockdwon or relaxes it, people in large numbers may storm cloth shops wherein it physical distancing will be difficult, Musliyar warned.

He said that Muslims in the region have decided to observe Eid ul Fitr, a festival which marks the end of the blessed month, in a simple way maintaining physical distance. Hence the lockdown should be relaxed only after the festival, he suggested.