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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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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, May 23: In order to ensure that students do not miss out on their studies due to educational institutions being shut owing to the coronavirus lockdown, Dakshina Kannada Pre-university College Principles Association (DKPUCPA) is conducting online classes on YouTube for pre-university students.

The online lessons are shot by lecturers at St Aloysius College and the lectures are then uploaded on YouTube enabling students to watch them online.

"The whole world is currently in a crucial situation because of COVID-19, and because of the lockdown, all are forced to stay indoors. Usually, we used to conduct lectures in a class full of students, but now it is a new experience that we are providing the same information to students in their absence," Rajaram Rao, a lecturer said while speaking to news agency.

He said at present these classes are being conducted for second year pre-university students.

If any student has a doubt on any concept, he said they can contact the teachers. "At present, students also are getting information about the teachers who have uploaded the videos. All the information about the teachers is already being uploaded on the system so that they can contact the teacher," he said.

Dhanya, a student, hailed the DKPUCPA for the setting up of the online classes despite the prevailing situation.

"The teachers who have taught in these classes have taught very well, as if they are teaching right in front of us. It has been very useful for me during this time," she said.

The nationwide lockdown imposed to combat the threat posed by the coronavirus pandemic has been extended to May 31.

Udupi, May 2: All the 18 people who were advised self-quarantine in connection with the Thekkatte petrol bunk incident have been tested negative, however, they were asked to continue the 14-day quarantine, said DHO Sudhirchandra Suda on Saturday.

the petrol bunk at Thekkatte was sealed after a Covid infected person had food and took bath at the petrol bunk, while he was travelling from Mumbai to Mandya.

The employees and the owner of the petrol bunk along with the six employees at Sasthana toll gate were asked to quarantine themselves for 14 days.