For killing Indian techie Srinivas Kuchibhotla, US man faces death or life in prison

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.

Riyadh, May 13: Saudi Arabia’s cabinet on Tuesday urged oil-producing nations not only to adhere to agreed cuts to production, but further reduce output to help restore balance in global oil markets, state news agency SPA reported.

In issuing the call to OPEC+, which includes members of the Organization of the Petroleum Exporting Countries plus Russia and other nations, ministers said the Kingdom is committed to supporting the stability of global oil markets.

After the meeting, acting Minister of Media Majed Al-Qasabi said that in addition to its commitment to the OPEC+ agreement, the Kingdom will voluntarily reduce output by an additional 1 million barrels a day in June. It will also try to implement additional cuts this month, with the consent of its customers, he added.

The cabinet said the Saudi initiatives aim to encourage other countries, whether they have signed up to the OPEC+ agreement or not, to adhere to its reduced rates and to cut output even further to help stabilize global oil markets.

During the cabinet meeting, which was conducted using video conferencing, King Salman also briefed ministers on his recent telephone conversation with US President Donald Trump. He said they affirmed the historical and strategic relationship between the two countries and their commitment to the continuation of joint efforts to enhance security and stability in the region.

Ministers were then updated on the latest developments in the corona virus crisis, including the steps being taken locally and internationally to control it and safeguard public health, the number of cases in the Kingdom and the care being provided to those who are infected. They also reviewed details of the active screening and testing programs in all parts of the country, which have helped to keep the number of deaths relatively low compared to global rates.

The cabinet praised the efforts being made by government officials to combat the pandemic, and stressed that citizens and expatriates must abide by the precautionary and preventive measures introduced to prevent the spread of the virus.

Ministers described the decision by Saudi Arabia to host the Pledging Event for the Humanitarian Crisis in Yemen 2020 on June 2 as an extension of the Kingdom’s humanitarian and development contribution, which reflects its pioneering role in supporting its neighbor.

The cabinet also welcomed the formation of the new government in Iraq and reiterated Saudi Arabia’s support for the nation and its readiness to work with the new administration to strengthen relations and enhance security and stability in the region.

Islamabad, Jun 6: Pakistan has reported a record 97 COVID-19 deaths in a single day, taking the total number of fatalities to 1,935, while the number of confirmed cases in the country approached 94,000 after over 4,700 infections were detected, the health ministry said on Saturday.

Punjab registered 35,308 COVID-19 cases, Sindh 34,889, Khyber-Pakhtunkhwa 12,459, Balochistan 5,776 Islamabad 4,323, Gilgit-Baltistan 897 and Pakistan-occupied Kashmir 331 cases, the Ministry of National Health Services said.

The total number of COVID-19 cases reached 93,983 after 4,734 new infections were detected across the country, it said.

With a record 97 fatalities in one day, the death toll in the country has reached 1,935, while 32,581 people have recovered from the disease.

The ministry said that the total number of active COVID-19 cases in Pakistan are 59,467, out of which 1,265 patients are in critical condition.

More than 100 labs in the country have so far conducted 660,508 tests, including 22,185 in the last 24 hours.

There are 747 hospitals across the country with COVID-19 treatment facilities where 5,060 patients are being treated. Others have been asked to self-isolate at home.