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Bengaluru, Jul 10: Karnataka Chief Minister BS Yediyurappa has quarantined himself at his personal residence after three persons posted at his official residence 'Krishna' tested positive for COVID-19. The Chief Minister, who held a cabinet meeting and also visited Karnataka's largest COVID-19 care centre on Thursday, has cancelled all his engagements scheduled for Friday.

In a statement issued on Friday afternoon, Yediyurappa said that he was healthy and will continue to work from his residence. The Chief Minister will remain in home quarantine till next week as protocol mandates. Three persons -- an electrician, a standby driver and a pilot vehicle staffer -- have tested positive for COVID-19.

"Since a few staff at my official residence Krishna have tested positive for COVID19, I will be working from my personal residence for the next few days. I will hold meetings, consultations and issue orders and suggestions via video conferencing. There is no need to worry. I am healthy. I appeal to everyone to take all precautionary measures and follow protocols issued by the government. Wear masks and ensure social distancing and help us contain COVID19," a statement from the Chief Minister said.

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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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 16: Rattled by the spurt in Covid-19 positive cases, a Karnataka minister on Wednesday said only god would save the people from coronavirus pandemic.

"Only god has to save us from the virus or the people should be made aware of the infection so that they wear mask and maintain social distancing," state Health Minister B Sriramulu told reporters in Chitradurga, 205-km northwest of Bengaluru.

Noting that the infection does not differentiate between rich and poor, police, doctors, politicians or legislators, Sriramulu said the communicable disease could rise to alarming level in the ensuing two months, as the cases were rising daily the world over.

"Who can control coronavirus? In the present situation, only god has to save us. Otherwise, the people should become aware of its (virus) consequences. If we have made mistakes, we are ready to face punishment for them," said Sriramulu, who is the ruling BJP's legislator from the Molakalmuru reserved assembly segment in the district.

Refuting the opposition Congress charge that the cases were rising in the state due to negligence by ministers, officials and legislators, Sriramulu said Karnataka was performing better than other states till the cases began to steadily rise since unlock started and the people were moving in violation of the guidelines.

A record 3,176 cases were reported from across the southern state during the day, taking the Covid tally to a whopping 47,253, including 27,853 active cases after 18,466 were discharged, with 1,076 during the day, while 928 succumbed to the virus, with 87 in the last 24 hours.

In Bengaluru, which is under 9-day lockdown since Tuesday night till July 22 morning, 1,975 positive cases were registered, taking its tally to 22,944, including 17,051 active after 5,455 were discharged so far, with 463 during the day, while 437 died of the infection, with 60 in the last 24 hours.