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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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

Kalaburagi, Feb 27: Kalaburagi police has issued notice to AIMIM leader Waris Pathan to appear before the investigation officer to give his statement in connection to the controversial statement that he recently made during an anti-CAA rally.

"We have already served notice to appear and the date is 29th. He is supposed to give his statement. Some people have already recorded their statements," said Kalaburagi Police Commissioner MM Nagaraj.

Recently while addressing an anti-CAA rally in Kalaburagi, the AIMIM leader had said: "Time has now come for us to unite and achieve freedom. Remember we are 15 crores but can dominate over 100 crores."

Bengaluru, Jul 23: A city hospital here has banned woman Covid patients from wearing dupatta (long scarf) or similar garments, after two women committed suicide, said an official on Thursday.

"Two patients committed suicides with their sarees, that's why we have changed the dress code," KC General Hospital superintendent Venkateshaiah said.

As part of the new dress code, the hospital has mandated that women patients should wear operation theatre dress, even though some older patients are not in favour of it.

Incidentally, both the deceased women went to the bathroom and hanged themselves with their sarees.

Meanwhile, the hospital has also asked the neighbouring patients to be vigilant and accompany them to the washroom.

"With the advice of our psychologist, two adjacent patients have been given the precaution that whenever a depressed patient goes to the bathroom, please go with them and stand outside to take care of them," said Vekateshaiah.

Similarly, the hospital is also thinking of giving a small dose of sedation to make them sleep in the night to avoid waking up.

To rejuvenate the spirits of the patients, the hospital has arranged televisions to show them the best health practices, programmes on meditation, movies and entertainment.

"We are not showing them only news, but also good food habits, how to take care of oneself amid Covid," he said.

Amidst all these efforts, the hospital's psychologist will continuously monitor the mental health of the patients with an aim to avoid any untoward incident.

Bengaluru continues to report the highest number of Covid cases, recording 2,050 on Wednesday, raising the city tally to 36,993, out of which 27,969 are active.