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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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

Mangaluru/Udupi, May 28: Coastal Karnataka witnessed further spike in covid-19 cases today with 27 people testing positive for coronavirus in Udupi and six in Dakshina Kannada. 

Among 27 coronavirus patients in Udupi 18 are males and 9 females. Among them 24 have come from Maharashtra, two from Telangana and one from Kerala. All of them were under quarantine.

As many as 147 confirmed cases of coronavirus have been reported so far in the district, including a death. Three have recovered, and 143 are active.

In Dakshina Kannada, 2 females aged 18 and 62, and four males aged 25, 36, 50 and 61, are the ones to be tested positive. All the six persons to test positive are Maharashtra returnees.

With this, the number of cases in DK has increased to 87, out of which 51 are currently active. As many as 29 persons have recovered and been discharged, and seven deaths have occurred so far.

Bengaluru, May 2: The Centre’s classification of districts created confusion in Karnataka as the state’s own categorisation deviates significantly from the health ministry’s list.

For instance, the Centre put the number of districts in the red zone in state at three, while the state Covid-19 war room puts it at 14. Bengaluru Urban and Mysuru figure in the red zone in both lists. While Bengaluru Rural with zero active cases on May 1makes it to the Centre’s red-zone list, it is in the orange zone according to the state.

In addition to these two, the state classifies Belagavi, Kalaburagi, Vijayapura, Bagalkot, Mandya, Bidar, Dakshina Kannada, Chikkaballapura, Dharwad, Gadag, Tumakuru and Davanagere as red-zone districts.

State Covid war-room authorities said they would take a look at the Centre’s criteria for classification and take a call. Besides, incharge Munish Mudgil pointed out that states are allowed to make additions to the red and orange zones. According to the Centre’s list, Karnataka has 13 districts in the orange zone and 14 in the green zone.

Sudan said, “the districts were earlier designated as hotspots or red zones, orange zones and green zones primarily based on the cumulative cases reported and the doubling rate. Since recovery rates have gone up, the districts are now being designated across various zones duly broad-basing the criteria.

This classification takes into consideration incidence of cases, doubling rate, extent of testing and surveillance feedback. A district will be considered under the green zone if there are no confirmed cases so far or if there is no reported case in the past 21 days.”