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Bengaluru, Jun 15: Karnataka Chief Minister B S Yediyurappa on Monday said those coming to the state from Chennai and Delhi will have to undergo three days of institutional quarantine followed by 11 days of home isolation.

Up till now a seven-day institutional quarantine was prescribed for those returning from Maharashtra, while there was no mandatory institutional quarantine for asymptomatic people returning to Karnataka from other states.

Those returning from states other than Maharashtra were asked to quarantine themselves at home.

"Those coming from Maharashtra are subjected to seven days of institutional quarantine followed by seven days of home quarantine, while those coming from Chennai and Delhi will have to go for three days of institutional quarantine and eleven days of home quarantine," Yediyurappa said.

Speaking to reporters here, he said the decision has been taken following the increase in the number of coronavirus cases from these states.

"It is because of returnees from other states the cases have increased, not because of the local (intra-state) movement, so we have to control people coming from outside, we have to quarantine them and have to tighten measures.

We are making honest efforts in this regard," he added.

Yediyurappa was speaking to reporters after chairing a meeting with top ministers and officials to discuss about the surge in COVID cases in the state.

"There are no plans for any lockdown, and we will request the Prime Minister for more relaxations," the Chief Minister said in response to a question.

Out of total 7,000 cases in the state 4,386 are returnees from Maharashtra and their contacts are 1,340.

Those who returned from abroad comprise 216.

Returnees from other states constitute- Delhi 87, Tamil Nadu 67, Gujarat 62.

Noting that there are indications that the coronavirus infections are expected to increase in the days to come, Yediyurappa assured people that the government will take all precautionary measures required, and appealed to people to cooperate, follow social distancing, and wear masks.

He said it has been decided to observe the coming Thursday as "mask days" by organising a walk across the state and the main event will be held at Vidhana Soudha, the state secretariat.

"Strict measures will be taken against those not wearing masks and not maintaining social distancing here on.

Initially Rs 200 fine will be imposed, this will be throughout the state," he said.

Further stating that the government has made special efforts to control the spread of COVID, he said a special COVID-19 taskforce has been constituted for Bengaluru and surrounding areas, BBMP (city civic body) commissioner and Deputy Commissioners of neighbouring districts have been asked to pay special attention.

As of June 14 evening, cumulatively 7,000 COVID-19 positive cases have been confirmed in the state, which includes 86 deaths and 3,955 discharges.

Out of 2,956 active cases in the state till last evening, 2,940 patients are in isolation at designated hospitals and are stable, while 16 are in ICU.

Yediyurappa said the state's mortality rate is 1.2 per cent while the national average is 2.8 per cent.

The state's recovery rate is 56.6 per cent and the national average is 51 per cent, he said, adding that 93 per cent of the total cases are asymptomatic while the remaining seven per cent are symptomatic.

In Bengaluru, there are 697 cases and out of them 330 are active. The city has reported 36 deaths.

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, May 23: Two more persons tested positive for covid-19 in Dakshina Kannada today taking the district's tally to 65.

One among them is a 30-year-old man who had returned from Maharashtra and was under quarantine. He underwent test at a private lab and was tested positive.

The other one is a 41-year-old woman who is a resident of Shirlalu in Beltangady and had symptoms of influenza-like illness. 

She was urged by residents in the surroundings of her house to go for a test. She was shifted to Wenlock COVID hospital in the morning on Saturday.