10-year-old girl used as human bomb in Nigeria attack

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.

Washington, Mar 28: The world is in the face of a devastating impact due to the coronavirus pandemic and has clearly entered a recession, the International Monetary Fund said on Friday, but projected a recovery next year.

"We have reassessed the prospects for growth for 2020 and 2021. It is now clear that we have entered a recession as bad or worse than in 2009. We do project recovery in 2021," IMF Managing Director Kristalina Georgieva told reporters at a news conference.

Georgieva was addressing the press after a meeting of governing body of the IMF, the International Monetary and Financial Committee. Representing 189 members, the body met virtually to discuss the unprecedented challenge posed to the world by COVID-19.

The key to recovery in 2021, she said, is only if the international community succeeds in containing the virus everywhere and prevent liquidity problems from becoming a solvency issue.

"The US is in recession, as is the rest of the advanced economies of the world. And in a big chunk of developed and emerging markets in developing economies. How severe? We are working now on our projections for 2020, Georgieva said in response to a question.

The new projections are expected in the next few weeks.

Stressing that while containment is the main reason for the economy to stand still and get into a recession, she said containment is very necessary to come out of this period and step in to recovery. "Until the virus is not contained, it would be very difficult to go to the lives we love."

"A key concern about a long-lasting impact of the sudden stop of the world economy is the risk of a wave of bankruptcies and layoffs that not only can undermine the recovery. But can erode the fabric of our societies," the IMF chief said.

To avoid this from happening, many countries have taken far-reaching measures to address the health crisis and to cushion its impact on the economy, both on the monetary and on the fiscal side, she said.

The IMF chief said 81 emergency financing requests, including 50 from lower-income countries, have been received. She said current estimate for the overall financial needs of emerging markets is 2.5 trillion dollars.

"We believe this is on the lower end. We do know that their own reserves and domestic resources will not be sufficient," she added.

The G-20, a day earlier, reported fiscal measures totalling some 5 trillion dollars or over 6 per cent of the global GDP.

Responding to another question, Georgieva said the IMF is projecting recession for 2020.

"We do expect it to be quite deep and we are very much urging countries to step up containment measures aggressively so we can shorten the duration of this period of time when the economy is in standstill," she said.

"And also to apply well-targeted measures, primarily focusing on the health system to absorb that enormous stress that comes from coronavirus. And on people, businesses and the financial system, I am very pleased to say that when we went through countries' responses, that sense of targeted fiscal measures is there and are also very impressive to see the size of these measures," she added.

"Countries are doing all they can on the fiscal and on the monetary front. We have heard from our members' very impressive decisions taken over the last days," the IMF chief said.

"We also want to caution that as we are responding now, we want to make the recession as possibly short and not too deep. We also want to think about what is going to follow the recovery and make sure that we are putting forward measures that can be supportive in this regard," she said.

Beijing, Feb 3: The first batch of patients arrived on Monday at a specialised hospital built in just 10 days as part of China's intensive efforts to fight a new virus.

Huoshenshan Hospital and a second facility with 1,500 beds that's due to open this week were built by construction crews who are working around the clock in Wuhan, the city in central China where the outbreak was first detected in December.

The Wuhan treatment centres mark the second time Chinese leaders have responded to a new disease by building specialised hospitals almost overnight. As severe acute respiratory syndrome, or SARS, spread in 2003, a facility in Beijing for patients with that viral disease was constructed in a week.

The first batch of patients arrived at the Huoshenshan Hospital at 10 am on Monday, according to state media. The reports gave no details of the patients' identities or conditions.

The ruling Communist Party's military wing, the People's Liberation Army, sent 1,400 doctors, nurses and other personnel to staff the Wuhan hospital, the official Xinhua News Agency said. The government said earlier some have experience fighting SARS and other outbreaks.

Authorities have cut most road, rail and air access to Wuhan and surrounding cities, isolating some 50 million people, in efforts to contain the viral outbreak that has sickened more than 17,000 and killed more than 360 people.

The Huoshenshan Hospital was built by a 7,000-member crew of carpenters, plumbers, electricians and other specialists, according to the Xinhua News Agency.               Photos in state media showed workers in winter clothing, safety helmets and the surgical-style masks worn by millions of Chinese in an attempt to avoid contracting the virus.

About half of the two-storey, 600,000-square-foot building is isolation wards, according to the government newspaper Yangtze Daily. It has 30 intensive care units.

Doctors can talk with outside experts over a video system that links them to Beijing's PLA General Hospital, according to the Yangtze Daily. It said the system was installed in less than 12 hours by a 20-member "commando team" from Wuhan Telecom Ltd.

The building has specialised ventilation systems and double-sided cabinets that connect patient rooms to hallways and allow hospital staff to deliver supplies without entering the rooms.

The hospital received a donation of "medical robots" from a Chinese company for use in delivering medicines and carrying test samples, according to the Shanghai newspaper The Paper.

In other cities, the government has designated hospitals to handle cases of the new virus.

In Beijing, the Xiaotangshan Hospital built in 2003 for SARS is being renovated by construction workers. The government has yet to say whether it might be used for patients with the new disease.