Ullal: Vigilantes attack college student for roaming with girl; two arrested

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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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, Apr 9: The Karnataka government is currently engaged in discussions with experts, specialists and other stakeholders to decide on its lockdown exit strategy and would take a final view by April 13, a key Minister said on Thursday.

"Day after tomorrow we have a VC (videoconference) with the Prime Minister," Medical Education Minister Sudhakar K, who is in-charge of all matters related to COVID-19, noted when asked about the States strategy.

He said a task force of specialist doctors on Wednesday submitted its report to the government, giving its recommendations.

"We are meeting lot of stakeholders of the society taking their views," the Minister said, adding, the Cabinet would also hold discussions.

"Finally, day after tomorrow, after discussing with the Prime Minister during the VC, the government will take a view on this by April 13 or so. As of now, we have not taken any view on it. We are studying all the reports," Sudhakar told PTI.

The Minister observed that the COVID-19 cases were slowly spiking in India but not multiplying the way they have in some other countries like Italy, Spain and the United States as the government had declared 21-day national lockdown early and taken other strict measures. "Let's see for one week and see."

"We need to fight this out collectively and by strictly following the quarantine methods and social distancing," Sudhakar stressed.

The Chief Minister B S Yediyurappa had on Wednesday said his government was in favour of lifting lock-down in districts which remained free from COVID-19 after April 14 subject to approval from the Centre.

"If the Prime Minister suggests to States to take decision (on lock-down) based on the situation in their respective States, my position is to take a call (on roll- back) in districts free from COVID-19," he had said.

"This is to allow people to go about their business and move about within the district and not from one district to another, after April 14, after taking the approval of the Prime Minister."

According to State officials, as many as 12 districts continue to remain free from COVID-19.

The task force has recommended continuation of lockdown at "hot spots" beyond April 14.

It has suggested that schools and colleges be shut till May 31, while non-air-conditioned shops can be opened.

Also, IT/BT companies, government offices providing essential services and factories can function with 50 per cent staff, the task force said in its recommendations for 15-day period after April 14.

Mangaluru, Ma 9: Three more persons from Bantwal taluk in Dakshina Kannada district tested positive for Covid-19 today. All three are members of a family.

The infection is reportedly linked to First Neuro Hospital of Mangaluru, which has emerged as a coronavirus hub in coastal Karnataka.

With this, the total number of coronavirus cases in the district mounted to 31 including six outsiders. Three of them have lost their lives. Currently there are 15 active cases in the district.

The newly identified coronavirus patients are a 30-year-old man and two elderly women aged 60 and 70 years.

They have contracted the infection from a 69-year-old man from Bantwal who was confirmed with COVID-19 infection on May 1. All the three members now infected belong to his family.

The man had got the infection from a woman identified as P-390. He happens to be a relative and neighbour of the deceased woman who belonged to Bantwal Kasaba village. Eight  members of his family were quarantined, of whom three tested positive today.