ADB triples COVID-19 response package to $20 billion

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.

Tehran, Jan 7: The Iranian Parliament on Tuesday ratified a motion dubbed as "harsh revenge", that considers all members of the US Pentagon and those responsible for the death of Major General Qasem Soleimani as "terrorist forces".

The triple-urgency motion is a modification of a previously ratified bill on April 23, 2019, that designated the US Central Command (CENTCOM) as a terrorist organization in retaliation to the same designation imposed on Iran's Islamic Revolutionary Guard Corps (IRGC) by Washington, the Tehran-based Mehr News Agency said in a report.

Parliament Speaker Ali Larijani said in Tuesday's open session that in the previous anti-US law, CENTCOM was designated as a terrorist entity.

"Today, following the cruel US measure in assassinating General Soleimani, the responsibility of which was accepted by the US President, we modify the previous law and announce that all members of Pentagon, commanders, agents and those responsible for the martyrdom of Gen Soleimani will be considered as terrorist forces," Larijani was quoted as saying in the report.

All of Iran nation supports the resistance, he added.

The modified law also allows withdrawal of $223 million to the IRGC's Quds Force from the National Development Fund of Iran for the next two months, added Larijani.

He said that the Supreme Leader Ayatollah Ali Khamenei's permission to withdraw the fund has been obtained, the Mehr report added.

Following its ratification, MPs chanted anti-US slogans at the Parliament.

Soleimani and his son-in-law and Abu Mahdi al-Muhandis, the second-in-command of Iraq's Popular Mobilization Front (PMF), along with eight other people were killed in the January 3 drone attack ordered by US President Donald Trump.

Soleimani, 63, was the elite Quds Force chief in charge of IRGC operations outside Iran, and has been on the ground in Syria and Iraq supervising militias backed by Tehran.

The Quds Force holds sway over a large number of militias across the region ranging from Lebanon to Syria and Iraq.

The attack has led to widespread condemnation in Iran. Supreme Leader Khamenei and President Hassan Rouhani has vowed revenge on the US.

On Sunday, Iranian MP Abolfazl Aboutorabi threatened to attack the heart of American politics.

During an open session of the Iranian Parliament on Sunday afternoon, President Trump was called a "terrorist in a suit" after he threatened to hit 52 Iranian sites hard if Tehran attacks Americans or US assets.

Karachi, May 23: Ninety-seven people were killed and two survived when a passenger plane crashed into homes in Pakistan's southern city of Karachi, health officials said Saturday.

The Pakistan International Airlines (PIA) plane had made multiple approaches to land at the city's airport when it came down in a residential area, damaging buildings and sparking a rescue operation that lasted into the night.

All passengers and crew had been accounted for and the bodies of those killed had been recovered from the crash site, the Sindh Health Ministry said, adding that 19 had been identified.

A local hospital earlier reported it had received the bodies of people killed on the ground.

The site remained cordoned off on Saturday morning.

The crash sent plumes of smoke were into the air as rescue workers and residents searched the debris for people and as firefighters tried to extinguish the flames.

An AFP reporter witnessed charred bodies being loaded into ambulances.

PIA said the plane lost contact with air traffic control just after 2:30 pm (0930 GMT) travelling from Lahore to Karachi.

The disaster comes as Pakistanis prepare to celebrate the end of Ramadan and the beginning of Eid al-Fitr, with many travelling back to their homes in cities and villages.