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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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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, June 19: Karnataka Chief Minister B.S. Yediyurappa''s home-office in the city centre was shut for sanitisation after the husband of a woman employee working there tested COVID-19 positive, an official said on Friday.

"The chief minister''s home-office has been closed for sanitisation after the employee''s husband tested positive for coronavirus," an official of the Chief Minister''s Office told media persons here.

The employee did not report for duty for two days after her husband was infected with the virus.

"The chief minister''s engagements, including an official event involving the state police department were shifted to the Vidhana Soudha (state secretariat)," said the official.

As the employee was on outpost duty, she did not come in contact with the Chief Minister or his cabinet colleagues and other senior officials.

Earlier in the day, the divisional railway manager''s office in the city centre was shut for sanitisation after a visiting employee tested positive for coronavirus.

"The three-floor DRM office has been closed for the day for santisation and all employees have been advised to work from home as one of our staffer who visited the office early this week tested positive for COVID-19 on Thursday," senior Divisional Commercial Manager Krishna Reddy told media persons here.

The DRM''s office is located adjacent to the Krantivira Sangoli Rayanna (KSR) main railway station in the city centre.

The state''s mini secretariat Vikas Soudha adjacent to the iconic Vidhana Soudha in the city centre has also been shut for sanitisation after a government employee working in it tested COVID positive.

The Bruhat Bengaluru Mahanagara Palike (BBMP), entrusted with the task of containing the virus spread, has already sanitised a portion of the massive building in the city centre.

After an employee of the food and civil supplies department tested positive, all offices on the ground floor of the mini-secretariat were sealed and sanitised.

The city registered 17 fresh cases on Thursday, taking the total number of positive cases to 844. With 14 discharged earlier in the day, 384 have been cured of the infection, while 408 are under treatment.

Of the 114 COVID deaths across the southern state since March 10, Bengaluru has accounted for 51 till date.