India plans to sell 76% stake in Air India, subsidiaries

Thiruvananthapuram, Apr 20: The Kerala health department has declared 88 local bodies including the corporation, municipality and panchayats, spread over 14 districts in the state as COVID-19 hotspots.

"The lockdown restrictions in these areas will be continued in the hotspots announced by the state health department," said state DGP Lokanath Behera in a statement.

"Hot spots are being announced based on COVID-19 positive cases, primary contacts and secondary contacts. As the outbreak of the disease increases, hot spots will be revised daily," said State Health Minister KK Shailaja.

However, the Minister said that a particular region will be excluded from the hot spot after a weekly data analysis.

District wise hot spots in the state - Thiruvananthapuram (3) including Thiruvananthapuram Corporation, Kollam (5), Alappuzha (3), Pathanamthitta (7), Kottayam District (1), Idukki (6), Ernakulam (2), Thrissur (3), Palakkad (4), Malappuram (13), Kozhikode (6), Wayanad (2), Kannur (19) and Kasaragod (14).

In Kerala, 400 people have detected positive for coronavirus, including 3 deaths, as per the Union Health Minister.

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.

New Delhi, Mar 29: The total number of COVID-19 positive cases rose to 1024 in the country, said Ministry of Health and Family Welfare on Sunday.

"The total number of COVID-19 positive cases rise to 1024 in India including 901 active cases, 96 cured/discharged/migrated people and 27 deaths," Ministry of Health and Family Welfare said.
Prime Minister Narendra Modi had on Tuesday announced a 21-day lockdown to stem the spread of COVID-19, which has left thousands dead around the world.