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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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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, Jul 6: As COVID-19 cases continue to surge in Karnataka, more than 20 police stations were sealed in Bengaluru after many policemen tested positive for novel coronavirus.

"Since the last few weeks, the number of COVID-19 cases in the police department has increased as many of the policemen have tested positive, so that's the reason why the police have taken a decision to close police stations," Bengaluru Commissioner of police Bhaskar Rao said.

He added, "However, people can lodge their complaints and other issues can be solved in help desks launched outside premises of the police station. Most of the areas where positive cases found in the police station are been sealed down for the safety of the people and sanitised them."

However, some of the police stations would be functional from outside the premises.

Commercial Street, Cottonpete, Chickepete, KG Halli traffic police station are among the few stations closed due to scare of the coronavirus spread after some policemen tested positive in particular stations.

Rao further said that the traffic police, civil police along with home guards have been given safety gloves, face masks, and sanitizers along with face covers by the department of police.

According to the Union Health Ministry, 23,474 COVID-19 cases have been reported in the state, as of Monday.

Bengaluru, Apr 6: The Covid-19 Task Force aims to conduct 80,000 throat swab and blood tests over the next three weeks here.

According to Task Force Nodal Officer C N Manjunath an order for one lakh anti-body test kits has been placed, and was expected to arrive on April 12.

"From January 20 to March 23, more than 1.2 lakh people arrived at international airports from abroad. Of these, we have kept 37,358 under observation. The Health officials and personnel in fever clinics and hospitals are being trained to conduct the tests. There is no necessity to obtain a clearance to test people with suspected infection. Only laboratories need to get permission to test their blood and throat swab samples."