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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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

Mangaluru/Udupi, June 28: The coastal districts of Dakshina Kannada and Udupi have recorded 97 and 40 fresh coronavirus positive cases in last 24 hours. 

With the highest single day spike, the total covid-19 positive cases in Dakshina Kannada mounted to 665, among which 272 cases are now active.

So far 313 people have recovered and discharged from the hospitals. 13 covid-19 patients have passed away. Two among them have died due to non covid reasons. 

With the 40 fresh cases, Udupi’s total mounted to 1179, among which only 135 cases are active. 1042 people have recovered and discharged from the hospitals. Two people passed away.

Mangalore, May 2: More than 500 families received ration kits in a distribution drive conducted by St Agnes College in outskirts of Mangaluru on Wednesday.

Since the lockdown was announced, the management, staff and alumni of St Agnes College are playing an active role in ensuring no one is deprived of food and essentials during these challenging pandemic times.

The College as part of its Agnes towards Community (ATC) programme had adopted villages such as Munnur, Harekala, Amlamogaru, Someshwara and Pavur. Various development drives are conducted in these villages by the staff and students. However, due to the COVID-19 lockdown, the activities undertaken in these villages were kept on hold.

The College recently received information from its network that several families in these villages are struggling for food and essentials.

The College management in association with its alumni and well-wishers took-up the initiative to distribute ration kits consisting of rice, dal, spices, tea powder, hygiene products and other essentials to 500 needy families belonging to these villages.

The drive was held in presence of Zilla Panchayat member Dhanalakshmi Gatty and other Gram Panchayat members.

"We were able to provide food to 600 and more families in different villages and to the stranded migrant workers in the city during this time of crisis because of the generous contributions of our staff, alumni and well wishes" says Sr Dr. M. Jeswina A.C.

The College management expresses its gratitude to all donors, especially the staff, alumni and those associated with the college.