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Bengaluru, Jul 15: With the state capital along with a few districts under lockdown to control the spread of Covid-19, Karnataka Home Minister Basavaraj Bommai on Wednesday said the measure was important to break the chain and people seem to have understood its importance.

Appealing for cooperation from the people, he asked them not to make it inevitable for police to use force in implementing the lockdown. "Traffic movement is less, there is a lockdown atmosphere everywhere, I feel that people have understood the importance... cooperation is required. I appeal to the people, if this lockdown has to be effective it has to be voluntary, only then we can control the rapid spread of coronavirus," Bommai said.

Speaking to reporters here, he said this lockdown is important, last time the infection was not up to this level. "This time areas that have a high number of infections- about five districts and Bengaluru city are going for lockdown. People have understood that this lockdown is to break the chain," he said. "Please don't make it inevitable for police to use force," he added.

Bengaluru urban and rural areas are under "complete lockdown" since last night at 8 pm and it will be effective till 5 am on July 22.

Following Bengaluru urban and rural, administrations in several districts like Dharwad, Dakshina Kannada, Kalaburagi (only in Urban areas), Bidar, Raichur (in Raichur city and Sindhanur) and Yadgir too have announced lockdown.

Noting that Police have taken all necessary strict measures to enforce lockdown in Bengaluru urban and rural districts by restricting the movement of vehicles and people, Bommai said barricades have been erected at various places and flyovers have been shut. People have been allowed to purchase vegetables and groceries till 12 noon, he said.

The government has warned of action in case of any violation of the lockdown rules. As of July 14 evening, cumulatively 44,077 Covid-19 positive cases have been confirmed in the state, which includes 842 deaths and 17,390 discharges. Bengaluru Urban district tops the list of positive cases, with a total of 20,969 infections.

Ballari, July 26: Karnataka's minister for forests and environment Anand Singh has tested positive for COVID-19 and is in quarantine at his residence in Hospet town of Ballari district.

Minister's son-in-law Sandeep Singh confirmed it and said he has been home-quarantined and the doctors are treating him at home. It is not known who have contracted the virus from him, he told.  

A few days back, the car driver of the minister had tested positive for Covid-19. Old house of the minister located at Ranipet here was sealed down and he was quarantined at his bungalow off the ring road. 

A week ago, the minister held a meeting which was attended by doctors, hotel owners, the officials and journalists. Hence, they have been advised to undergo Covid-19 test, said a Government hospital doctor.

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