'Don't know what will happen after one year'

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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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, Apr 19:  Karnataka's Technical Education department following Union Home Ministry’s guidelines, on Sunday directed all its colleges not to use the Zoom application to conduct online classes during the ongoing lockdown period.

Considering Union Home Ministry's advisory that Zoom app is not safe, the department has taken the decision and issued a circular asking all government, aided and unaided engineering, polytechnic (Diploma) colleges to stop using the app immediately.

The department recommended the use of a free app developed by TCS: "TCS iON Digital class room" or any other App recommended by All India Council for Technical Education (AICTE) to conduct the online classes.

Bengaluru, Jan 15: Srishti Institute of Art, Design and Technology in Bengaluru has decided to remain shut for two days after a group of BJP workers wiped out graffiti on its outer walls claiming it as anti-Modi and allegedly warned them against any anti CAA agitation there.

According to sources, the group led by Yelahanka MLA S R Vishwanath allegedly even towed away some vehicles of students and faculty parked in front of the institute alleging that they were blocking the road and causing inconvenience to the local people.

Some students have alleged that they were threatened by BJP workers and also the institute's authorities regarding the graffiti and the blocking of the road using traffic police.

They even claimed that BJP workers warned them against organising any anti-NRC or CAA protests.

A few local residents are also said to have joined the BJP workers and raised complaints about the conduct of the institute's students.

According to local BJP workers, the MLA and a few party men had gone near the institute on receiving complaints from locals about vehicles parked there blocking the road, and when they came across the graffiti they painted it with saffron paint to avoid any controversy, and there was no altercation as being alleged.

However, there is no clarity on who drew the graffiti regarding Modi, which according to BJP workers allegedly depicted the PM in poor light.

The institute has declared holiday on Thursday and Friday to avoid any further escalation, keeping the interest and safety of students in mind, sources said.

Interestingly, on Tuesday graffiti had appeared overnight on the shutters of some shops and walls on the Church Street against Modi, CAA and NRC, following which the city police have launched an investigation.