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Kasaragod, Mar 23: The district administration on Monday decided to abandon efforts to map out the movement details of the NRI who came from Dubai recently and came into contact with many in North Kerala.

The district has been completely locked down since Monday morning, on the directive of the Central Government. Prohibitory orders have been slapped in the district since Sunday night to restrict socialisation of the people.

As the person now in isolation have allegedly been non-cooperative, the authorities were finding it difficult to sketch out a rote map as his movement and socialisation has been so vast and wide since his arrival here on March 12.

The middle aged and popular NRI who landed at Karipur airpprt on March 11 had been in Calicut till midnight prior to boarding the Maveli Express to make it to his hometown Kasaragod, which is 160 kms away from Calicut. He had come into contact with very many, including two MLAs of the district, prior to getting tested positive and getting isolated in the hospital.

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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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, Mar 31: Venkara Raghava, a software engineer from Bengaluru, who was infected with the coronavirus has recovered and is currently "doing perfectly well".

"I am doing perfectly well now. I had travelled to Los Angeles via Heathrow airport and that is when I came in contact with many travellers. I might have picked up the infection there," Raghava told news agency.

It was in Los Angeles when he started getting a 'low-grade fever' which led him to prepone his flight to Bengaluru. "When I landed back in Bengaluru on March 8, I had a fever and I isolated myself. The same day I went to a hospital where my travel history was taken and I tested positive for COVID-19", he said.

The next day, he was admitted to the isolation centre. His entire family was also tested but the results came back negative.

When asked about what does suffering from COVID-19 feel like, he responded that it was a like a regular viral fever and was "nothing to be scared of". "The fever is very grinding, and since my childhood, I never had a fever. I had a fever for almost 15 days consistently 100 degrees (F)," he said.

About his experience at the isolation centre, he said that it was an experience unlike that of a hospital. "At the isolation centre, one has to take care of themselves, unlike a hospital where doctors and nurses take care of the patient. I had to put a wet cloth on myself and you cannot overdose yourself with Calpol or Paracetamol," he said.

For him, "The tough times are now over" and now he has fully recovered but in the process, he ended up losing about five kilograms. "After the fifteenth day when I woke up with no fever, they took a test for the nose and the throat and it came back negative," he recalled, and on March 22, he was set free.

For one week, he has been in self-quarantine at home "being completely watchful" that the symptoms do not reoccur.

The number of total coronavirus cases reached 1,251 on Monday. There are 1117 active cases in the country, according to the Ministry of Health and Family Welfare.