For first time in years, astronaut quits NASA training

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.

Lahore, Jul 10: The Punjab government enforced smart lockdown in seven cities of the province for 15 days with an immediate effect from Thursday night, The News International reported.

The Primary and Secondary Healthcare Department on Thursday issued a notification under the Punjab Infectious Diseases Ordinance 2020, about enforcement of lockdown in Lahore, Multan, Faisalabad, Gujranwala, Sialkot, Gujrat and Rawalpindi, till July 24 midnight.

In Lahore, the lockdown will be enforced in A2 Block Township, EME Society, Main Bazaar Chungi Amr Sadhu, Punjab Government Servants Housing Scheme, Wapda Town, C-Block Jauhar Town and Green City.

The basic necessities of life will remain available in smart lockdown areas. "The purpose of the smart lockdown is to minimise movement of people in hotspots of positive coronavirus cases," said Capt (retd) Muhammad Usman, Secretary, Primary and Secondary Healthcare Department.

The country registered 2,751 new COVID-19 cases during the last 24 hours, taking the tally to 243,599 on Friday. The province-wise breakup includes 85,261 cases in Punjab, 100,900 cases in Sindh, 29,406 in Khyber Pakhtunkhwa, 11,099 in Balochistan, 13,829 in Islamabad, 1,619 in Gilgit-Baltistan and 1,485 in Pakistan-occupied Kashmir.

The death toll due to the virus reached 5,058 with 75 more deaths reported over the last 24 hours, as per data cited by Radio Pakistan.

Los Angeles, Jul 2: New daily coronavirus cases in the United States soared past 50,000 for the first time Wednesday, as the World Health Organization delivered a grave warning that the global pandemic is accelerating.

Restaurants, bars and beaches in the world's worst-hit nation closed from California to Florida, as states reeling from yet another surge in the deadly virus braced for Independence Day festivities.

Global infections have hit their highest level in the past week, WHO data showed, with chief Tedros Adhanom Ghebreyesus saying new cases topped "160,000 on every single day."

The grim milestone came as the European Union left the United States, Brazil and Russia off its final list of nations safe enough to allow residents to enter its borders.

With more than 52,000 new COVID-19 cases in the United States alone in the past 24 hours, according to a Johns Hopkins University tally, several US states imposed 14-day quarantines on visitors in the buildup to the long weekend's July 4 celebrations.

California suspended indoor dining at restaurants in Los Angeles and several counties, while New York scrapped plans to allow restaurants to seat customers inside from next week.

President Donald Trump reiterated his belief that the contagion will "at some point... sort of just disappear, I hope."

But the US leader who has yet to be seen in public wearing a face mask during the pandemic added he would have "no problem" doing so.

EU travel ban eased

The rollbacks came as the European Union reopened its borders to visitors from 15 countries.

The bloc hopes relaxing restrictions on countries from Algeria to Uruguay will breathe life into its tourism sector, choked by a ban on non-essential travel since mid-March.

Travelers from China, where the virus first emerged late last year, will be allowed to enter the EU only if Beijing reciprocates.

And Brazil -- which has suffered the most deaths globally for the last week, and is the second-worst affected country overall -- was excluded entirely.

It topped 60,000 total fatalities Wednesday, after suffering 1,000 deaths in just 24 hours.

However, with over 10 million known infections worldwide and more than 500,000 deaths, the pandemic is "not even close to being over", the WHO warned.

Data provided by the UN health agency for the seven days from June 25-July 1 showed the highest number of new daily cases ever recorded came on June 28, when over 189,500 new cases were registered worldwide.

'Dutch brothels reopen'

According to the United Nations, the coronavirus crisis could cost global tourism and related sectors from $1.2 to $3.3 trillion in lost revenue.

Greece, which has suffered fewer than 200 virus deaths, has seen its economy hit hard by lockdowns and travel restrictions -- all but ending its lucrative tourism season before it began.

Romanian Cojan Dragos was "the first tourist" in one Corfu hotel after driving there with his wife and daughter.

"We have the whole hotel just for us," he told news agency.

Separately, Spain and Portugal held a ceremony as they reopened their land border.

The Netherlands also confirmed the reopening Wednesday of another tourist draw -- its brothels and red-light districts.

"I'm totally booked," said sex worker Foxxy, adding that she had held a "little party" when she heard restrictions would be lifted.

Clusters spur new lockdowns

Russia did not make the EU's list of approved countries so its citizens will be absent from the bloc's tourist hot-spots.

The country, however, enjoyed a public holiday Wednesday as it voted in a referendum to approve constitutional changes allowing President Vladimir Putin to stay in power for another 16 years.

Putin was forced to postpone the vote in April as his government tackled an outbreak that has infected almost 650,000 people -- the third-highest in the world.

In other countries, clusters are still causing problems.

Parts of the Australian city of Melbourne suffered sharp rises in infections, spurring new stay-at-home measures.

The Palestinian Authority announced a five-day lockdown across the West Bank after a surge in confirmed cases.

And textile factories in the central British city of Leicester were suggested as the reason for a spike in infections that has prompted the reimposition of local restrictions.

Americas spike

In the United States, spikes across southern and western states are driving a surge in national infections.

Texas, which again smashed its daily COVID-19 record with over 8,000 new cases, joined Florida and California in closing some beaches for the upcoming holiday weekend.

Apple announced it would close another 30 US stores on Thursday, half of them in California.

A further 700 deaths nationwide took the US past 128,000 deaths in total.

The Pan American Health Organization warned that the death count in Latin America and the Caribbean could quadruple to more than 400,000 by October without stricter public health measures.

The US government announced this week it had bought 92 percent of all remdesivir production -- the first drug to be shown to be relatively effective in treating COVID-19.

Britain and Germany, however, said Wednesday they had sufficient stocks of the drug.

'Corona baby'

In Britain, some 1,500 acts from Ed Sheeran and Coldplay to Paul McCartney and The Rolling Stones urged the county's government to save the live music industry, which has been collapsing because of the coronavirus.

But while lockdown measures have been a disaster for many, some have welcomed the chance to spend more quality time with hard-working partners.