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Bengaluru, May 28: The Karnataka government has done away with previously mandatory COVID-19 testing for asymptomatic international travellers. 

The development comes a day after the government issued a circular, which allowed placing of international travellers into home quarantine if they had completed seven days of institutional quarantine.

A circular signed by Jawaid Akhtar, Additional Chief Secretary to the State Government, dated May 27, says that any “person who has completed seven days of institutional quarantine and is asymptomatic can be permitted for home quarantine with a COVID-19 test (RT-PCR), subject to undergoing a medical check-up.”

This check-up equates to thermal screening (with a required temperature of under 37.5C or 99.5F and pulse oximetry of under 94%). 

The circular added that all elderly people, over the age of 60, and those with comorbidities (such as Diabetes mellitus, hypertension, asthma, heart ailment, renal disease...etc) are “required to be clinically evaluated diligently prior to shifting them for quarantine.”

On Wednesday, Pankaj Pandey, Commissioner, the Department of Health and Family Welfare said that these new guidelines were based on recommendations from the COVID Task Force. A member of the COVID Task Force said that new strategies had been formulated based on the latest findings on how the SARS-Cov-2 virus affects people.

Bengaluru, July 13: The Karnataka government today announced the cancellation of I PUC supplementary examinations across the state. 

Primary and Secondary Education minister S Suresh Kumar announced that the government took the decision in the wake of rising cases of Covid-19 and re-introduction of the lockdown. According to sources in the education department, as many as 60,000 students were supposed to appear for the examination.

Previously, the state government had decided to hold these exams at the college level in every district and publish the results by 30 July. However, the government has withdrawn even that arrangement and completely cancelled the exams. 

According to the minister, all the students who failed in the I PUC examination, shall also be promoted to II PUC. "The students who have attended all the subjects but unable to pass the exams will also be promoted to the next class," Suresh Kumar said.

However, those who missed out on the exams due to health reasons or failed in the examinations will be given a small test at the time of commencing classes for II PUC to assess their learning ability at the college level, according to the minister. "Only those students who missed out on the examination due to shortage of attendance will not be promoted to the next class," Suresh Kumar clarified.

London, May 20: The current physical distancing guidelines of 6 feet may be insufficient to prevent COVID-19 transmission, according to a study which says a mild cough in low wind speeds can propel saliva droplets by as much as 18 feet.

Researchers, including those from the University of Nicosia in Cyprus, said a good baseline for studying the airborne transmission of viruses, like the one behind the COVID-19 pandemic, is a deeper understanding of how particles travel through the air when people cough.

In the study, published in the journal Physics of Fluids, they said even with a slight breeze of about four kilometres per hour (kph), saliva travels 18 feet in 5 seconds.

"The droplet cloud will affect both adults and children of different heights," said study co-author Dimitris Drikakis from the University of Nicosia.

According to the scientists, shorter adults and children could be at higher risk if they are located within the trajectory of the saliva droplets.

They said saliva is a complex fluid, which travels suspended in a bulk of surrounding air released by a cough, adding that many factors affect how saliva droplets travel in the air.

These factors, the study noted, include the size and number of droplets, how they interact with one another and the surrounding air as they disperse and evaporate, how heat and mass are transferred, and the humidity and temperature of the surrounding air.

In the study, the scientists created a computer simulation to examine the state of every saliva droplet moving through the air in front of a coughing person.

The model considered the effects of humidity, dispersion force, interactions of molecules of saliva and air, and how the droplets change from liquid to vapour and evaporate, along with a grid representing the space in front of a coughing person.

Each grid, the scientists said, holds information about variables like pressure, fluid velocity, temperature, droplet mass, and droplet position.

The study analysed the fates of nearly 1,008 simulated saliva droplets, and solved as many as 3.7 million equations.

"The purpose of the mathematical modelling and simulation is to take into account all the real coupling or interaction mechanisms that may take place between the main bulk fluid flow and the saliva droplets, and between the saliva droplets themselves," explained Talib Dbouk, another co-author of the study.

However, the researchers added that further studies are needed to determine the effect of ground surface temperature on the behaviour of saliva in air.

They also believe that indoor environments, especially ones with air conditioning, may significantly affect the particle movement through air.

This work is important since it concerns safety distance guidelines, and advances the understanding of the transmission of airborne diseases, Drikakis said.