PM Modi strongly disapproves vandalism of statues

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.

Bhopal, Jun 20: A senior BJP MLA in Madhya Pradesh tested COVID-19 positive hours after he cast his vote for the Rajya Sabha polls in the state and attended party meetings, an official said on Saturday. The legislator's wife has also tested positive for the infection, he said.

Voting for three Rajya Sabha seats in the state took place on Friday.

The couple's test reports came on Friday night and the news of the MLA's infection triggered panic among other MLAs with some of them reaching hospitals to get themselves tested.

"The MLA and his wife were found infected with COVID- 19 in the tests conducted by a private laboratory. We are examining their condition and making a decision whether they need to be hospitalised or home quarantined," a health department official told.

He said that the MLA's contact tracing has been initiated.

"Further tests are also being conducted," he said.

He is the second legislator in Madhya Pradesh, who was tested coronavirus positive.

Earlier, a Congress MLA was found infected. He had voted for the Rajya Sabha polls on Friday after reaching the state assembly complex wearing a PPE suit.

Talking to , a member of the BJP MLA's family said that the medical team was called on Friday afternoon for the COVID-19 test after the legislator's wife complained of uneasiness.

"The MLA and his wife gave the samples to the medical team for the COVID-19 tests on Friday afternoon and they were told at night that both of them have tested positive for the infection," he said.

After the news of BJP MLA testing positive spread, a senior BJP MLA from Mandsaur, Yashpal Singh Sisodiya, reached government-run J P Hospital here along with two other party MLAs.

Talking to reporters, Sisodiya said, "I came here along with two other MLAs from our division- Dilip Makwana (Ratlam Rural) and Devilal Dhakad (Garoth)- after we came to know through media and social media that one of the MLAs from our division has tested positive for COVID-19."

"We don't have any symptoms, but came to test for COVID-19 as a precautionary measure," he said.

Dhakad said that he came for testing as he had dined with the MLA two days back.

Talking to , Madhya Pradesh State Assembly's Principal Secretary A P Singh said that all the precautionary measures were taken during the Rajya Sabha polling.

"All employees were in safety gears during the Rajya Sabha election process. The assembly campus was being sanitised every 15-20 minutes during the polling process...We are now going through the CCTV footage to trace those who had come in his contact," he said.

Congress MLA and former minister P C Sharma said that those who came in contact with the BJP legislator should be traced and quarantined.

"The employees and MLAs who came in contact with him during the voting process should be tested," Sharma said.

New Delhi, May 17: Eight of the 10 most valued domestic firms suffered a combined erosion of Rs 1,37,311.31 crore in market valuation last week, with Reliance Industries (RIL) taking the biggest knock.

Only Bharti Airtel and ITC from the top-10 list managed to close the week with gains.

RIL's market cap plunged Rs 65,232.46 crore to Rs 9,24,855.56 crore.

The market valuation of HDFC Bank declined Rs 22,347.07 crore to Rs 4,87,083.88 crore and that of Hindustan Unilever Limited tanked Rs 13,192.26 crore to Rs 4,77,458.89 crore.

ICICI Bank's market cap dropped Rs 9,770.06 crore to Rs 2,08,900.79 crore.

Infosys witnessed a decline of Rs 9,518.84 crore in valuation to reach Rs 2,77,814.09 crore while that of HDFC tumbled Rs 9,370.38 crore to Rs 2,83,293.70 crore.

The m-cap of Kotak Mahindra Bank slipped by Rs 7,805.2 crore to Rs 2,25,327.22 crore.

Tata Consultancy Services' market valuation dipped Rs 75.04 crore to Rs 7,10,439 crore.

In contrast, Bharti Airtel added Rs 13,147.89 crore to its valuation to stand at Rs 3,02,292.43 crore.

ITC's valuation also rose by Rs 7,744.11 crore to Rs 2,02,330.13 crore.

In the ranking of top-10 firms, RIL retained the number one spot, followed by TCS, HDFC Bank, HUL, Airtel, HDFC, Infosys, Kotak Mahindra Bank, ICICI Bank and ITC.

During the last week, the Sensex declined 544.97 points or 1.72 per cent.