Mumbai’s shame: Dying woman molested on bridge during stampede

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.

Bengaluru, May 7: Karnataka has revised its standard operating procedure (SOP) for international passengers. The first group of passengers will arrive in the state on May 8.

The number of categories has been reduced to two from three. Category A includes passengers symptomatic on arrival while Category B passengers are those asymptomatic on arrival. These are passengers who are either healthy or those having co-morbidities.

As per the revised SOP, the passenger will be released on the seventh day, if tested negative, to strict home quarantine for another seven days with stamping.

This norm is in contradiction to the Ministry of Home Affairs’ SOP for international passengers. As per the MHA’s SOP, the passengers (asymptomatic) will be under institutional quarantine for 14 days. Testing negative after 14 days, they will be allowed to go home and will undertake self-monitoring of their health for 14 more days.

On the contradiction, Pandey said, "We don't take chances as we rely on tests instead of just quarantining. Other states may be depending on just 14-day institutional quarantine."

"GOI SOP doesn't talk about Covid tests on international passengers. We have put an additional safety layer of three Covid tests on returnees -- one on arrival, second from 5-7 days and last on 12th day. This will ensure definite identification of positive cases even if they are asymptomatic and their subsequent treatment. We should look at the spirit behind the order," he added.

On the 14-day additional reporting period for category B, he said, "It is implied as category B patients should report to us for 14 days after their first 14-day quarantine period is over."

Medical Education Minister Dr K Sudhakar said that the State would follow the Centre’s norms.

Till Tuesday, Karnataka’s SOP had three categories. Under Category A (symptomatic), 14-day institutional quarantine at COVID-19 Health Care Centre was mandatory followed by 14-day reporting period. Under Category B (asymptomatic above 60 years with co-morbidities), seven-day institutional quarantine at hotel/hostel followed by seven-day home quarantine and 14-day reporting period had been recommended. The 14-day home quarantine and 14-day reporting period was mandatory for Category C (asymptomatic).

Mangaluru, Apr 19: The covid-19 being spread by the novel coronavirus has claimed a life in the coastal district of Dakshina Kannada.  

The victim, a 50-year-old woman from Bantwal taluk, breathed her last at Wenlock Hospital today morning. 

She was rushed to a private hospital yesterday after she developed breathing problems. Then she was shifted to Wenlock Hospital's block for suspected coronavirus patients, and placed in the intensive care unit (ICU).

Her throat swab was collected the same day and sent for testing for coronavirus. However, today morning her condition worsened and she passed away.

The report was received on later on Sunday afternoon, which confirmed that she had contracted coronavirus.

The woman's family members including her husband, son and mother-in-law have been placed under quarantine. It is learnt that her mother-in-law's condition is serious and she has been admitted to the ICU.

The throat swabs of all the three family members have been sent for coronavirus test. According to sources, the woman's son had come from Dubai recently.

Meanwhile, a 30-year-old woman from Uppinangady, who is undergoing treatment in a hospital, today tested positive for the covid-19.

With the confirmation of two new cases, the total number of reported covid-19 cases in Dakshina Kannada reached 15. Out of which only two case are currently active and 12 have been discharged. Another one passed away.