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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.

Bengaluru, Mar 4: Seeking to allay fear among the citizens in the wake of Coronavirus scare, Karnataka Health Minister B Sriramulu on Wednesday made an appeal to the people not to pay heed to rumours spreading on social media.

In a series of tweets, Mr Sriramulu assured people that the government has taken adequate measures to ensure that the disease does not spread further. "Don't lend your ears to rumours about the Coronavirus in the social media. Rely only on the authentic information," he tweeted.

The minister's tweet came as Bengaluru reported the first case, after a techie from the city with a travel history to Dubai and interaction with Hong Kong-based people there, was admitted to a hospital in Hyderabad.

As panic gripped the city, Mr Sriramulu said the apartment where the software engineer was staying has been sanitised. Besides, his 25 colleagues have been identified. One of them has been admitted to the hospital as a precautionary measure and his blood sample has been sent for lab test.

"So far 40,207 people have been screened at the International airport. 251 blood tests have been done, of which 238 were found negative, while the rest of the reports are yet to come," Mr Sriramulu tweeted.

The health department said three people have been admitted to the isolation ward at the Rajiv Gandhi Institute of Chest Diseases (RGICD).

Meanwhile, a parent appealed to people not to panic about the Coronavirus in the techie's apartment, where his son too resides. "My son is from the same apartment. To update everyone, there is absolutely nothing wrong here. It was more of panic on social media that created this," he said in a message.

He said that the man who is in Telengana and testedpositive stayed in this building on February 21. "His roommate was taken to hospital and has tested negative," he said. It is been two weeks since the incident. The virus cansurvive only for 48 hours under optimal conditions, he noted. "Everyone in this building is safe. Please educate yourself. Refrain from spreading panic and misinformation." he added.

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