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Bengaluru, Jun 26: All efforts would be made to control the spread of coronavirus in the city and there will be no fresh lockdown, Karnataka Chief Minister B S Yediyurappa on Friday said, asserting that improving economic situation of the state is also equally important.

Though the state capital was considered a model for the entire country in COVID management and has seen a spike in cases during the last few days, the pandemic can be controlled if everyone cooperated, he said.

His remarks come a day after Revenue Minister R Ashoka said Bengaluru is still 'safe' compared to the COVID-19 situation in other cities and states and had ruled out a fresh lockdown for now, putting to rest speculations that it was planning such a move in view of spike in cases.

As of Thursday evening, a total of 1,791 COVID-19 cases, including 78 deaths and 505 discharges, had been reported in the city while the state's tally stood at 10,560 compared to just 3,408 cases as on June 1. The state capital has the highest number of cases among the districts.

"There is no question of imposing lockdown for any reason. In some areas (with high case load) we have already implemented lockdown, other than those places there is no question of it being implemented in other places," Yediyurappa told reporters here.

Improving the economic situation of the state was also equally important, he said ahead of his meeting with Ministers, MLAs and MPs of all parties from Bengaluru to discuss measures to control COVID-19.

"I will discuss with all MLAs including those from opposition and Ministers from Bengaluru and come to some decision. With their cooperation we will make all honest efforts to control the pandemic in Bengaluru," he added.

Earlier, there had been intense speculation after some ministers said the government may have to consider re-imposing the lockdown, eased in phases from the middle of last month, in view of continuing spike in new cases in the past several days. Bengaluru was a "model" to the entire country in COVID management, but in recent days cases have increased, Yediyurappa said, adding to control it cooperation from everyone was necessary.

"I have confidence that if everyone (MLAs) pays special attention in their respective assembly constituency, COVID can be controlled," he said. Meanwhile, official sources said the Chief Minister has given Revenue Minister Ashoka the charge of overseeing the COVID management in the city.

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, Jul 13: In an attempt to avoid the ugly scene of migrant workers walking to their native places due to the current week-long lockdown imposed in the state, the Karnataka State Road Transport Corporation (KSRTC) is running 1,600 additional buses on Monday and Tuesday to help them return safely.

The KSRTC has already run 249 additional buses from the State capital and has so far ferried 6,641 passengers and 231 buses have been booked.

The KSRTC appealed to the public not to panic as additional buses have been deployed. "After ensuring social distance and conducting thermal screening, passengers will be allowed to travel. It has already been planned to operate additional buses," the corporation stated in a press release here.