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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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

Udupi, July 14: Due to rising COVID-19 cases in this district, Deputy Commissioner G Jagadeesh on Tuesday, announced that the border will be sealed down from July 15.

Speaking to newsmen here on Tuesday, he said “Inter-district travelers will not be allowed to enter Udupi for 14 days from 8 pm on Wednesday, however, we won’t be imposing complete lockdown in the district.”

The decision was taken in the meeting held in his chamber in which Legislators Haladi Srinivas Shetty (Kundapur), Sunil Kumar (Karkala), Rghupathi Bhat (Udupi), Sukumar Shetty (Byndoor), among others were present.

Mangaluru, Mar 24: Seven people were arrested on Tuesday for violating prohibitory orders imposed under Section 144 of CrPC in Mangaluru during the lockdown in Karnataka, Commissioner of Police PS Harsha said.

Chief Minister BS Yediyurappa on Monday had announced a complete lockdown in the state till April 1.
"In the wake of the coronavirus outbreak, the entire state will be locked down from 12 am of March 23 to April 1. People are requested to strictly follow it to contain the coronavirus spread," he said.
Earlier, the state government had ordered the suspending of all public and private transport services.
According to the data compiled by the Indian Council of Medical Research (ICMR), the total number of the infection-related death toll in the country rose to nine on Tuesday, while the total number of active cases reached 482.