NRIs need not to link Aadhaar with bank accounts, clarifies UIDAI

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.

Udupi, June 2: The number of positive cases may continue to be more in Udupi district since the results of more than 3,000 samples are pending with Labs.

The district total cases to 260. The figure had seemed far-fetched on May 15, when the number of cases stood at just three. The latest spike has been attributed to the return of migrants from other States as well as from abroad. These samples are from people who returned to the district in the last two weeks.

This delay is because the laboratories testing samples from Udupi are burdened with a high case-load after more than 8,500 people returned to the district, particularly from the neighbouring state of Maharashtra.

"Samples have piled up after the influx of people returning from other states and from abroad," says Dr Prashant Bhat, nodal officer for COVID-19 in Udupi. This delay has caused returnees in institutional quarantine to stay on for as long as 18 days.

The designated laboratory for coronavirus testing in Udupi is Wenlock District Hospital in Mangaluru. The district administration also sends samples to laboratories at the Kasturba Hospital in Manipal, Yenepoya Medical College, Mangaluru, KS Hegde Medical Academy, Mangaluru, and Viral Diagnostic Laboratory in Shivamogga. Apart from Udupi, the laboratory in Manipal is also testing samples from Uttara Kannada district. The laboratory in Shivamogga is also testing samples from Shivamogga and Bijapur districts. The laboratories in Mangaluru, similarly, have samples from Dakshina Kannada district.

Dr Avinash Shetty, Medical Superintendent of Kasturba Hospital in Manipal, one of the private laboratories being used by the Udupi district administration, said that they are testing samples in batches. "We received around 600 samples today and we will be testing them now. The backlog of samples should be cleared in the next few days," Dr Avinash said.

All 73 cases reported in Udupi on Monday were patients with travel history of returning from Maharashtra or patients with travel history of returning from abroad.

In cases of some patients who tested coronavirus positive in the past week, people were released from institutional quarantine after a stipulated period only to be tracked down again and admitted in hospitals after their results returned positive.

While two such cases emerged in Belapu and Belman in the district, the administration is now following up with others who were released from institutional quarantine to ensure they remain in home quarantine till their test results are confirmed.

The spike in cases among returning migrants in Udupi also comes at a time the Karnataka government reduced restrictions on interstate travel.

New Delhi, Jun 11: The death toll due to COVID-19 rose to 8,102 and the number of cases climbed to 2,86,579 in the country after it registered the highest single-day spike of 357 fatalities and 9,996 cases till Thursday 8 AM, according to the Union Health Ministry data.

The number of recoveries remained more than the active novel coronavirus cases for the second consecutive day.

The number of active cases stands at 1,37,448 while 1,41,028 people have recovered and one patient has migrated to another country, as per the data.   

"Thus, around 49.21 per cent patients have recovered so far," an official said.

The total number of confirmed cases include foreigners.

Of the 357 new deaths reported till Thursday morning, 149 were in Maharashtra, 79 in Delhi, 34 in Gujarat, 20 in Uttar Pradesh, 19 in Tamil Nadu, 17 in West Bengal, eight in Telangana, seven each in Madhya Pradesh and Haryana, four in Rajasthan, three each in Jammu and Kashmir and Karnataka, two each in Kerala and Uttarakhand, one each in Andhra Pradesh, Bihar and Himachal Pradesh.

Out of the total 8,102 fatalities, Maharashtra tops the tally with 3,438 deaths followed by Gujarat with 1,347 deaths, Delhi with 984, Madhya Pradesh with 427, West Bengal with 432, Tamil Nadu with 326, Uttar Pradesh with 321, Rajasthan with 259 and Telangana with 156 deaths.

The death toll reached 78 in Andhra Pradesh, 69 in Karnataka and 55 in Punjab. Jammu and Kashmir has reported 51 fatalities due to the coronavirus disease, while 52 deaths have been reported from Haryana, 33 from Bihar, 18 from Kerala, 15 from Uttarakhand, nine from Odisha and eight from Jharkhand.

Chhattisgarh and Himachal Pradesh have registered six COVID-19 fatalities each, Chandigarh has five while Assam has recorded four deaths so far. Meghalaya, Tripura and Ladakh have reported one COVID-19 fatality each, according to the ministry's data.

More than 70 per cent of the deaths are due to comorbidities, the ministry's website stated.