State-sponsored terrorism most dangerous: Dr Shridhar

Mangaluru, May 12: The Karnataka government has ordered that Dakshina Kannada and Udupi districts be considered as one unit for the movement of people to undertake permitted activities between 0700 hrs to and 1900 hrs.

Principal Secretary and Member Secretary, Karnataka State Disaster Management Authority, T K Anil Kumar, in an order, said that there was no need for different passes for commuting by people between these two districts.

However, people should carry their identity cards issued by their respective enterprises/ companies to show that they are carrying out permitted activities only, he 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of the American Medical Association, noted that the the current guidelines issued by the WHO and CDC are based on outdated models from the 1930s of how gas clouds from a cough, sneeze, or exhalation spread.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

Mangaluru/Udupi, Jul 7: Coastal districts of Dakshina Kannada and Udupi crossed 100 plus Covid19 positive cases mark again on Tuesday, after slipping to double digit cases for a day on Monday. While Dakshina Kannada accounted for 83 of these cases and one death, Udupi tallied 28 fresh cases taking the combined tally of new cases to 111.

DK stood second behind Bengaluru Urban that recorded 800 out of 1,498 new cases that the state recorded for the day.

In all, 48 primary contacts testing positive led DK district’s spurt of 83 cases, Sindhu B Rupesh, deputy commissioner, said. Influenza like illness (ILI) cases accounted for 20 of the 83 cases, one each were diagnosed with severe acute respiratory illness (SARI) and from pre-surgery sample collected before delivery, two had history of inter-district travel, three each were cases of random, pre-surgery samples and source of infection being traced.

A 65-year-old male from Moodbidri who had co-morbid conditions including diabetes, pneumonia and heart ailment succumbed to the pandemic during the day. He was admitted for treatment at a private hospital on July 3. With this, the death toll due to coronavirus in DK district rose to 26 and two of them are due to non-Covid reasons including a case each of suicide and a person succumbing to liver cirrhosis and they tested positive post death.

G Jagadeesha, deputy commissioner, Udupi district said the 28 new cases took the total positive cases in Udupi to 1390. With 1182 patients discharged and three deaths, Udupi as on date has 205 active cases. Those who tested positive include KSRTC driver who travelled to Bengaluru, vegetable vendor at Adi Udupi market and people with travel history to Tumakuru, Bengaluru, Mumbai, Dubai and two even from DK and rest primary contacts, DC said.

Health authorities in DK district also discharged 99 patients during the day to keep their active cases tally at 650. The two districts combined have 855 active cases as on date. As per revised protocol issued by the department of health and family welfare, the district administration also permitted 28 patients with mild symptoms to undergo home isolation while the rest are being treated either at private hospitals or at the designated Covid19 hospital for DK.