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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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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 9: Bringing to the fore the dangers frontline workers face in combating the deadly coronavirus, 395 policemen have tested positive for the infection since the outbreak of the pandemic in Bengaluru. This includes five deaths, Inspector General of Police and Additional Commissioner of Police (Administration) Hemant Nimbalkar told media persons.

He said as of Thursday, 190 have been cured while 200 are under treatment. Twenty police stations have been sealed, he added.

He claimed the Bengaluru police has suffered the most compared to any department, organisation or institution because the force is deployed in the field and dealing with the situation.

The infection among police is highest despite training being given to them on how to protect themselves from the coronavirus.

According to him, every morning duty charter is given to the police personnel where they are told how to avoid getting the infection and handle the situation if they find symptoms of coronavirus.

"Despite taking all the precautions, infection in our department is high because we are the ones who are on the road.

We are meeting hundreds of people whom we don't know, whether they are Covid infected or not," Nimbalkar said.

Along with the policemen, their families too are at risk of contracting the virus.

An assistant sub-inspector at VV Puram police station was the first casualty in the Bengaluru police on June 13.

A heart patient, who was on leave due to ill health, he collapsed at home and died.

Tumuku, Jul 6: Senior Congress leader and Kunigal MLA Dr H D Ranganathm tested positive for COVID-19 on Monday.

The 48-year-old Congress legislature, a doctor by himself, was admitted to Manipal hospital and recovering, he said in a tweet.

Dr Ranganath said he took all precautions, yet could not save himself from the virus and advice people to not to take the contagion lightly.