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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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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, Mar 6: PVR Cinemas on Friday launched its five-screen multiplex in here, augmenting its presence in Karnataka across 15 properties to 103 screens and to 46 properties and 286 screens in southern India.

With this opening, PVR consolidates its growth momentum in the current financial year 2019-20, so far opening 83 screens in the year and bringing its portfolio to 841 screens at 176 properties in 71 cities.

"We feel proud to cross the 100 screens milestone in the state of Karnataka at the very beginning of the year," said Joint Managing Director Sanjeev Kumar Bijli.

"Southern India has a strong market with significant growth potential. In Bengaluru, we have introduced some of our best formats and offerings owing to the nature of preferences by our customers," he said in a statement.

Pramod Arora, Chief Growth and Strategy Officer at PVR Ltd, said the company will continue to enhance the consumer experience through innovation and set new benchmarks in the Indian multiplex industry.

PVR is the largest and the most premium film exhibition company in India, serving over 100 million patrons annually.