366 farmers arrested in Gujarat after clash with police

New Delhi, Jun 22: With an increase of 14,821 new cases and 445 deaths, India's COVID-19 count reached 4,25,282 on Monday.

According to the latest update by the Union Ministry of Health and Family Welfare (MoHFW), 13,699 deaths have been recorded due to the infection so far in the country.

The rise in confirmed cases today is lower than the highest spike of 15 thousand plus cases registered on Sunday.

The count includes 1,74,387 active cases, and 2,37,196 cured/discharged/migrated patients.

Maharashtra with 1,32,075 confirmed cases remains the worst-affected by the infection so far in the country. The state's count includes 60,161 active, 65,744 cured, discharged patients while 6,170 deaths have been reported due to the infection so far.

Meanwhile, the national capital today became the second-worst affected region in the country with the number of confirmed cases in Delhi reaching 59,746 as opposed to Tamil Nadu's 59,377 cases.

While 2,175 deaths have been reported in Delhi due to the infection so far, the toll in Tamil Nadu stands at 757.

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, May 25: The pending class 10 and 12 board exams will be conducted by CBSE at 15,000 centres across the country instead of 3,000 centres planned earlier, Union HRD Minister Ramesh Pokhriyal 'Nishank' announced on Monday.

The exams, which were postponed due to a nationwide lockdown imposed on March 25 to contain the spread of COVID-19, will now be held from July 1 to 15.

"The class 10, 12 exams will now be conducted at over 15,000 exam centres across India. Earlier, CBSE was slated to hold exams at only 3,000 centres," Nishank said.

The decision has been taken to ensure social distancing at exam centres and minimise travel for students.

The HRD ministry has already announced that students will appear for exams at schools in which they are enrolled rather than external examination centres.

According to home ministry guidelines, there will be no exam centre in COVID-19 containment zones and states will be responsible for making transport arrangements for students to reach their respective centres.

Usually, board examinations are held at designated test centres to ensure minimum bias from schools and enable independent external invigilators to monitor the examination process.

While Class 12 exams will be conducted across the country, the Class 10 exams are only pending in North East Delhi, where they could not be held due to the law-and-order situation in the wake of protests against the amended citizenship act.

The CBSE class 10 and 12 board exam evaluation is being carried out from home.

The HRD ministry had earmarked 3,000 evaluation centres from where answer sheets would be distributed to teachers at their homes for evaluation and then collected.

Universities and schools across the country have been closed since March 16 when the Centre announced a countrywide classroom shutdown as one of the measures to contain the COVID-19 outbreak.

Later, a 21-day nationwide lockdown was announced on March 24, which came into effect the next day. It has now been extended till May 31. The board was not able to conduct class 10 and 12 exams on eight examination days due to the coronavirus outbreak.

Due to the law-and-order situation in North East Delhi, CBSE was not able to conduct exams on four examination days, while a very small number of students from and around this district were not able to appear in exams on six days.

The board had last month announced that it will only conduct pending exams in 29 subjects which are crucial for promotion and admission to higher educational institutions.

The modalities of assessment for the subjects for which exams are not being conducted will be announced soon by the board.

The schedule has been decided in order to ensure that the board exams are completed before competitive examinations such as engineering entrance JEE-Mains, which is scheduled from July 18-23 and medical entrance exam NEET that will be held on July 26.