Jet Airways CFO Amit Agarwal steps down

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.

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.

New Delhi, Apr 8: The death toll due to the novel coronavirus rose to 149 and the number of cases to 5,194 in the country on Wednesday, according to the Union Health Ministry.

While the number of active COVID-19 cases is 4,643, as many as 401 people were cured and discharged and one had migrated, it said.

The total number of cases include 70 foreign nationals.

According to the ministry's data updated at 9 a.m., 25 new deaths have been reported since Tuesday.

Sixteen deaths were reported from Maharashtra, two each from Delhi, West Bengal, Haryana and Tamil Nadu and one from Andhra Pradesh.

Maharashtra has reported the most coronavirus deaths at 64, followed by Gujarat  and Madhya Pradesh at 13 each and Delhi at 9.

Telengana, Punjab and Tamil Nadu have reported seven fatalities each.

West Bengal has registered five deaths, Karnataka and Andhra Pradesh have reported four each, Uttar Pradesh, Haryana and Rajasthan have recorded three deaths each.

Two deaths each have been reported from Jammu and Kashmir and Kerala.

Bihar, Himachal Pradesh and Odisha reported one fatality each, according to the health ministry data.

However, a PTI tally of figures reported by various states as on Tuesday 9.45 p.m. showed 5,192 testing positive across the country and at least 162 deaths.

There has been a lag in the Union Health Ministry figures, compared to the numbers announced by different states, which officials attribute to procedural delays in assigning the cases to individual states.

The highest number of confirmed cases in the country are from Maharashtra at 1018, followed by Tamil Nadu at 690 and Delhi with 576 cases.

Telengana has reported 364 COVID-19 cases followed by Kerala at 336.

Rajasthan has 328 cases, Uttar Pradesh has 326 and Andhra Pradesh reported 305 coronavirus cases.

Novel coronavirus cases have risen to 229 in Madhya Pradesh, 175 in Karnataka and 165 in Gujarat.

Haryana has 147 cases, Jammu and Kashmir has 116, West Bengal has 99 and Punjab has 91 positive patients so far. Odisha has reported 42 coronavirus cases.

Thirty- eight people were infected with the virus in Bihar while Uttarakhand has 31 patients and Assam 27.

Chandigarh  and Himachal Pradesh have 18 cases each while Ladakh has 14 positive patients so far.

Ten cases each have been reported from the Andaman and Nicobar Islands and Chhattisgarh. 

Goa has reported seven COVID-19 infections, followed by Puducherry at five cases. Jharkhand has reported four cases and Manipur two. 

Tripura, Mizoram and Arunachal Pradesh have reported one case each.

"State-wise distribution is subject to further verification and reconciliation," the ministry said on its website.