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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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

Bengaluru, May 3: Undergraduate and postgraduate students skipping online classes held by their universities run the risk of being debarred from writing their exams. 

State universities, which are monitoring the attendance of online classes, are asking their affiliate colleges to send the monthly online attendance details and this would reflect in their regular attendance. This would apply to those studying professional courses like medicine and engineering. 

State medical education minister Dr K Sudhakar has asked all medical colleges to regularly send attendance details to the Rajiv Gandhi University of Health Sciences (RGUHS).

RGUHS vice-chancellor Dr Sachidanand confirmed to DH that the varsity is indeed monitoring the attendance of students. “Online classes are equal to classroom teaching. (Such method of conducting classes) are necessary during the Covid-19 pandemic and the nationwide lockdown,” he said.

According to the Supreme Court directions, students should have 75% attendance to be eligible to appear for the final exams. There could be relaxations if they have health issues. If students are bunking online classes, it would reflect on their minimum attendance necessary to appear for the exams, the vice-chancellors of state-run varsities said.

Bangalore University vice-chancellor Prof K R Venugopal said most of the students are attending online classes and teachers are messaging the parents of those who are irregular. “(Of course) if they fall short of the minimum attendance, they won’t be allowed to appear for the exams,” he said.

Bengaluru North University vice-chancellor Prof T D Kemparaju said the administration has asked its teachers to record details of students attending online classes and update the university.

Mixed signals 

Meanwhile, the University Grants Commission (UGC) on Wednesday issued guidelines directing all universities to treat the lockdown period as “deemed as attended” for students and research scholars. Experts pointed out that the order would prompt students not to take the online classes seriously.

“Arrangements have been made at the state varsities to make students attend online classes compulsorily and students are also serious about it. Now, because of the UGC guidelines, they may bunk classes,” said the vice-chancellor of a state-run university.