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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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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

Mangaluru, Apr 23: An elderly woman who was tested positive for COVID-19 in Dakshina Kannada district today breathed her last.

The deceased is a 77-year-old woman from Bantwal taluk. 

She is said to be a close relative of the Bantwal woman who died of COVID-19 on April 19.

She was shifted to govt Wenlock Hospital which is now converted into COVID-19 hospital on April 22 from a private hospital.

Her throat swabs were sent for testing. Health and family welfare department earlier today confirmed that she was tested positive for coronavirus.

Within hours she breathed her last without responding to any treatment. 

So far 17 corona positive cases have been confirmed in the district including two deaths. Most of them have returned home after recovering.

Bengaluru, May 11: As many as 343 Indians returned to Bengaluru from London by a special Air India flight on the fifth day of 'Vande Bharat Mission' on Monday. They arrived at the Kempegowda international airport at 4.40 am.

All passengers were found to be asymptomatic on arrival except one 27-year-old woman who had had an incomplete abortion and had vomiting on arrival. She has been shifted to KC General Hospital in Malleshwaram.

Dr Prabhu Dev Gowda, an officer on duty for COVID-19 screening at Kempegowda International Airport, said, "A 27-year-old woman has had an incomplete abortion of her three-month-old foetus before taking the flight from London. She was vomiting on arrival. She was shifted to Aster CMI Hospital for emergency care.”

“Thereafter, she and her husband were shifted to KC General Hospital in Malleshwaram. They will be in isolation there. Since there is nobody to look after her, we have to let the husband accompany her to the hospital where they will be in quarantine."

The patient was famished and was provided a few idlis on arrival, he added.

After she recovers at the hospital, the couple will be shifted to a hotel. As per protocol, their throat swabs were taken for COVID-19 testing too. All passengers whether symptomatic or not are being tested for COVID-19.

Dr Manjula Devi, District Health Officer, Bengaluru Rural district said that all passengers were found to be asymptomatic on arrival except this woman who is being treated as a non-COVID-19 emergency.

Ajith Rai, Devanahalli Tehsildar told DH, "All passengers have chosen to go to hotels over government hostels. We're yet to tabulate how many have chosen budget hotels, three-star and five-star hotels. Twenty of them are still here. The process is on."