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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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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, Jun 26: Karnataka Congress president DK Shivakumar on Thursday suggested that the cost of building and installing a new statue of Nada Prabhu Kempegowda in the Bengaluru airport should be borne by Kempegowda international airport (KIAL).

Shivakumar wrote to Chief Minister BS Yediyurappa and welcomed the decision of erecting a statute of Bengaluru founder Kempegowda at KIAL but he also suggested that the chief minister should not spend state government's money on this.

He said that the Karnataka government has done many favours to airport authority earlier.

Bengaluru, Mar 13: Amid coronavirus outbreak, all universities, malls, and clubs will remain closed for a week in Karnataka. Karnataka CM Yediyurappa has said no one should travel unless it's an emergency. "All malls, cinema halls, pubs, wedding ceremonies and other large gatherings in the Karnataka have been banned for another one week," Chief Minister Yediyurappa said. This comes hours after the Uttar Pradesh government had decided that all schools, colleges situated in the state will be closed till 31st March 2020.

Following the decision, the Karnataka government on Friday asked doctors and other health staff to work on public holidays also till the spread of coronavirus is contained. Leaves and all week off of state health ministry workers have also been canceled. The government issued a circular stating that certain emergency measures are being taken to control the spread of coronavirus is some parts of the State.

"To manage things in a result-oriented manner, doctors, office personnel, paramedical staff and other permanent and contract employees in hospitals coming under the Health Department have been instructed to work on all public holidays." the government order read.

The decision comes after 76-year-old man in Karnataka's Kalaburagi died of coronavirus and became India's first COVID-19 victim. 46 people in Kalaburagui have been kept under coronavirus quarantine since then. Out of 46, 31 have been put under the "high risk" category. The high-risk persons were shifted to ESIC hospital. Officials said four family members of the man have displayed flu symptoms and their swab samples have been sent for testing in Bengaluru.

Earlier on Friday, an employee of Google's Bengaluru office tested positive for n-coronavirus, taking the total COVID-19 positive cases in Bengaluru to 5. India's total coronavirus positive count rose to 75. Several other states including capital Delhi, Madhya Pradesh, Odisha, Bihar, and Uttar Pradesh invoked various sections of the epidemic disease act. Meanwhile, the Indian Army has also called off all recruitment drive in wake of coronavirus outbreak.