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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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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 19: Karnataka on Tuesday recorded the highest single-day rise in the COVID-19 cases in the state as a whooping 149 people tested positive for the virus. With the spike in new cases, the overall tally has risen to 1,395.

This is for the first time the state recorded 100 plus cases in a single day. So far, 40 people have also succumbed to the virus including three deaths today. 

The new deaths consist of a 61-year-old male patient, a resident of Ballari; a 65-year-old male patient, a resident of Vijayapura; and a 54-year-old male patient from Bengaluru.

Among the new cases, a maximum of 71 are reported from Mandya, followed by 22 in Davanagere, 10 in Shivamogga, 13 in Kalaburgi, six in Bengaluru Urban, four each in Udupi and Uttara Kannada, five in Chikkamagaluru, three in Hassan and one each in Yadagiri, Chitradurga, Vijayapura, Gadag.

Most of the new cases are of the people who traveled to Mumbai in Maharashtra, Solapur, Ahmedabad, and Kerala.

The remaining are those who came in contact with the people who had tested positive earlier.

At present, 811 people are actively taking treatment, while 543 have been discharged after recovery.

Bengaluru, Apr 22: The Karnataka government has announced partial relaxation of COVID-19 lockdown norms in the state allowing certain construction activities, manufacturing of packaging materials, courier services, among others, from April 23.

The activities will be permitted only outside the COVID-19 containment zones identified by the government.

Service provided by self-employed people like electrician, IT repair, plumbers, motor mechanics, and carpenters in local areas have also been given exemption.

Tea, coffee and rubber plantation have been allowed to work with 50 per cent workforce, and a similar exemption have been given to processing, packaging, sale and marketing of these produce.

“To mitigate hardship to the public, select additional activities have been allowed,which will come into effect from 00.00 hours of April 23,” Chief Secretary TM Vijay Bhaskar said in an order on Wednesday.

However, these additional activities will be operationalised by District Administrations and BBMP (city corporation in the case of Bengaluru city) based on strict compliance to the guidelines on lockdown measures, it said.

Before operating these relaxations, district administrations and BBMP (city corporation) shall ensure that all the preparatory arrangements on social distancing in offices, work place establishments as also sectoral requirements are in place, it said, adding that relaxations will not apply in containment zones.

Facing a financial crunch, the state government has been eager to kick-start economic activities in the state that had come to halt due to the coronavirus lockdown.

While hospitality services, bars, malls, theatres, shopping complexes, religious and places of worship among others will continue to remain shut, relaxation of norms has been for activities that are linked to essential services such as health, infrastructure and agriculture.

As per the order, while, public transportation will continue to remain suspended till May 3,private vehicles with passes for emergency services and personnel commuting with passes to places of work and back will be allowed.

Activities permitted include construction of roads, irrigation projects, buildings and all kinds of industrial projects, including MSMEs, in rural areas and all kinds of projects in industrial estates, where workers are available on site and no one is required to be brought in from outside.

Also permitted to function are manufacturing units of essential goods – drugs, pharmaceuticals, medical devices, their raw materials and intermediates;

food processing industries in rural areas, coal production (mines and mineral production and activities incidental to mining) besides manufacturing units of packaging materials.