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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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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 12: In view of the rising COVID-19 cases in Bengaluru, a complete lockdown will be implemented in Bengaluru City and Bengaluru Rural areas from 8 pm on July 14 to 5 am on July 22.

"Essentials such as hospitals, groceries, milk, fruit, vegetables, medicines will be available during this period. In addition, medical and postgraduate examinations will happen as already scheduled," the Karnataka CMO informed.

Chief Minister BS Yediyurappa appealed: "Co-operate with all social security policies, wear masks, and abide by government-issued lock-down guidelines for buying everyday items. Your collaboration is essential to controlling the spread of COVID-19 infection."

"I would like to congratulate all Asha activists, medical and police personnel, officers, volunteers, journalists and all those who work directly and indirectly to control the spread of COVID-19 infection," he added.

Mangaluru, Jul 15: A septuagenarian from Bantwal taluk died due to coronavirus infection at a hospital in the city taking the covid-19 death toll in Dakshina Kannada to 54.

The deceased was a 73-years-old and a resident of Kasaba village in Vittal, Bantwal. Recently eight members of his family were tested positive for covid-19 including his son.

He was admitted to a hospital in Mangaluru where he was tested positive for the virus. He did not respond to the treatment and breathed his last, sources said.

The final rites were carried out by a team of trained activists of Popular Front of India (PFI) at a designated graveyard. All necessary precautions were taken by the authorities concerned and police during the funeral.