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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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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 5: A 50-year-old woman with breathing difficulties died on Saturday after a shortage of beds forced 12 hospitals to refuse admission.

Her husband Babu said the family had approached 12 hospitals in three days, including Victoria Hospital and other private facilities, who all slammed their doors on them, citing a shortage of beds. The woman died on Saturday, a few minutes into her admission at KC General Hospital.

Second death 

A 35-year-old man, Manjunath, also died on Saturday after enduring fever for three days and being refused admission at several hospitals due to a shortage of beds.

As his condition worsened, his wife admitted him to a private hospital on Saturday after hours of ordeal. But the man died less than 15 minutes after getting admitted. Hospital authorities took swab samples from the deceased and said the body would be handed over after the test results.

BBMP personnel also failed to shift the body of a Covid-19 patient in Kalasipalya almost a day after the death.

Despite civic workers disinfecting the place, the neighbours were in a state of panic after the body was kept at home.

Bengaluru, May 3: Karnataka Education Minister S Suresh Kumar on Saturday said that those who want to travel from other states to Karnataka and vice-versa must register on 'Sevasindhu' website.

"Those who want to travel from other states to Karnataka and from Karnataka to other states must register on 'Sevasindhu' website, then all intimation will be shared from the government side," Kumar said.

Karnataka Health Department on Saturday said that three deaths and 12 new COVID-19 cases were reported in last 24 hours in the state.

According to the Health Department, the total number of coronavirus positive cases in the state is now 601. 271 patients have either been cured or discharged. The virus has killed 25 people so far in the state.