JD(S) to highlight how communalism hit the development in coastal Karnataka

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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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 21: The group who had attacked police and healthcare workers at the minority-dominated Padarayanapura in the city on Sunday night had raised slogans ''kill police'' when the team went to quarantine some people, the police alleged in an FIR.

Around 100 to 120 people rushed out onto the road targeting the police and health workers who wanted to pick up primary and secondary contacts of coronavirus patients.

Cases have been registered against the miscreants based on the complaint of police officers.

In one of the FIRs, police sub-inspector Raman Gowda complained that when he went to quarantine 43 people with the healthcare officers, around 120 people rushed out and attacked them.

"The group of people holding sticks and stones rushed from Arafat Nagar," Mr Gowda said.

When he was trying to stop them from destroying a CCTV camera, the mob attacked him shouting slogans ''Kill the police. Don't spare them," he alleged in the FIR.

"They wanted to kill us with stones and sticks and some of our staff sustained injuries," the officer said.

According to police, 59 people have been arrested including A woman who had allegedly masterminded the attack.