Karnataka: Highest sex ratio among Christians; Muslims overtake Hindus in literacy

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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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 15: With lockdown-3 coming to an end in a couple of days, Karnataka Chief Minister B S Yediyurappa on Friday expressed confidence about the Centre announcing relaxation to "many things" after May 17.

"After May 17, the government of India is going to relax so many things, let us wait for it," he said in response to a question from reporters here. "According to me they (centre) will relax everything.... maybe for things like five-star hotels and others they may not give permission for the time being, but for other things they are going to give permission. Let's wait and see."

The nationwide lockdown was initially imposed from March 25 to April 14, then extended to May 3 and again to May 17 to prevent the spread of the novel coronavirus. Karnataka Tourism Minister C T Ravi on Wednesday had hinted at the state government permitting the opening of gyms, fitness centres and golf courses, also certain hotels for local tourism purpose after May 17, when the third phase of the COVID-19 induced lockdown comes to an end.

The Muzrai department (in charge of the administration of temples) was also planning to have a Standard Operating Procedure (SOP) in place, that needs to be followed at temples once they are opened for the public, officials have said. They said the opening of temples for the public is however subject to the MHA (Ministry of Home Affairs) guidelines.

During the recent video conferencing Prime Minister Narendra Modi had with Chief Ministers of various states, Yediyurappa had proposed doing away with district wise colour-coding and instead advocated strict cordoning of containment zones to control the spread of the pandemic.

He had pitched for resuming all economic activities in stand-alone establishments while continuing the restrictions on malls, cinema halls, dining facilities and establishments with centrally controlled air-conditioning. The CM had suggested that 50 to 100 meters around known clusters be declared as containment zones and commercial activities, including public transport, to be allowed in non- containment zones.

Bengaluru, Apr 29: As many as 11 more people have tested positive for the coronavirus in the last 24 hours in Karnataka, said the State's Health Department on Wednesday.

According to an official statement, 11 new COVID-19 positive cases were reported from 5 pm on April 28 to 5 pm on April 29.

"With this, the total number of positive coronavirus cases in the state has mounted to 534, of which 20 deaths have been reported and 215 people have recovered," added the statement.

Of 20 coronavirus patients who died, one death was due to the non-COVID cause, the statement further said.