Big surnames came, went but India did not prosper: PM

New Delhi, May 20: With 5,611 new cases reported in the last 24 hours, India's COVID-19 tally reached 1,06,750 on Wednesday, according to the Union Ministry of Health and Family Welfare.

As many as 140 deaths have been reported in the last 24 hours, taking the total number of deaths to 3,303.

Out of the total cases, 61,149 are actives cases and 42,298 patients have been cured/discharged/migrated.

Maharashtra continues to remain the worst-affected state with 37,136 cases, followed by Tamil Nadu (12,448 cases), Gujarat (12,140 cases), and Delhi (10,554 cases).

The nationwide lockdown imposed as a precautionary measure to contain the spread of coronavirus has been extended till May 31.

New Delhi, Apr 14: With 1,211 fresh cases of coronavirus reported in the last 24 hours, the total number of confirmed cases of COVID-19 in the country has reached 10,363 including 339 deaths, said Lav Aggarwal, Joint Secretary, Health and Family Welfare, here on Tuesday.

As many as 1,036 people have recovered from the disease so far, said Aggarwal during the daily media briefing on the coronavirus. "In one day, 179 people were diagnosed and found cured," he added.

"A total of 10,363 confirmed cases have been reported in India including 339 deaths and 1,036 people, who were COVID-19 positive have recovered. Out of the total deaths, 31 deaths have been reported in the last 24 hours," said Aggarwal.

Aggarwal said that an evaluation of each district and city will be done till April 20.

"An evaluation of each district and city will be done till April 20 in which it will be evaluated what measures did that authorities take in these cities and districts to combat COVID-19," he said.

"Based on the results of this litmus test approach, permission will be granted for some selective activities to those districts and cities which controlled the situation effectively. Detailed guidelines will be issued soon," he added.

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.