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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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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, May 22: Uber said on Friday it has resumed its operations in Bengaluru, Mysuru, Mangaluru, and Hubballi, in compliance with Lockdown 4.0 guidelines issued by the Government.

Riders in Bengaluru can book UberAuto, UberGO, Premier, Intercity, Hourly Rental, UberXL, Access, and Assist on their Uber App.

UberAuto, UberGO, Premier, and Intercity are available in Mysuru, UberGO and Intercity services in Mangaluru, and UberAuto services in Hubballi.

Uber Intercity operations will be limited to travel with necessary authorisation and within state boundaries and permissible zones only, the company said in a statement.

Uber said it has launched comprehensive measures such as the distribution of PPE kits, including masks, sanitisers and disinfectants to drivers and the introduction of mandatory educational video courses for them.

Mangaluru, Mar 29: The test report of the man from Uppoor in Udupi district, who committed suicide fearing he had contracted coronavirus infection, has returned negative for the virus.

Health department officials in Udupi said the post- mortem test report had shown that he did not have the virus infection and asked the people in the area not to panic.

Gopalakrishna Madivala (56), had hanged himself on Wednesday suspecting he had the disease, leaving a death note to family members asking them to stay safe.