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Mysuru, May 15: The Temple Town of Nanjangud was till now treated as one unit or a Cluster Containment Zone and was put under complete lock-down as per the containment protocol listed under COVID-19 regulations and Disaster Management Act, 2005.

However on Friday, some of the restrictions have been lifted by Mysuru Deputy Commissioner Abhiram G Sankar who permitted certain activities as no fresh positive cases were reported from the cluster area. The Cluster Containment Zone was declared on March 29 following one employee of Nanjangud-based Jubilant Generics tested positive for the killer Coronavirus. As there were chances of the positive person spreading the disease to other employees of the factory, the cluster rules were enforced. Moreover, there were over 1,000 employees in the Pharma Company and a majority of them lived in and around Nanjangud.

The declaration of Cluster Containment Zone with complete lock-down and quarantining of all the Pharma Company employees proved a success to the District Administration as whoever tested positive – over 73 were later tested positive — had already been quarantined and the dangerous community spread phase was successfully prevented. To a major extent, the Corona virus curve has been flattened. As such, restrictions have been relaxed a bit on Friday.

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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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