Varavara Rao tests coronavirus positive

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.

Wayanad, May 14: Coronavirus scare has gripped the police in the district as around 70 personnel, including their chief, have gone on quarantine as a precautionary measure after three colleagues tested positive for the pathogen.

A day after three personnel of Mananthavady police station tested positive for COVID-19, District Superintendent of Police R Illango said on Thursday he and others decided to quarantine themselves as they had been in contact with some other colleagues from the station. Twenty four personnel, including a Deputy Superintendent of Police, have gone on quarantine after giving their samples for testing three days ago as a measure of abundant caution after a man questioned in Manathavady police station in connection with a case tested positive for the virus on May 9.

Of the 24, results of 18 have been received so far and three personnel tested positive on Wednesday, following which the station has been disinfected and virtually closed and contact tracing underway.

On Wednesday, the SP and some other police personnel had interacted with the DySp for close to an hour at a checkpost following which over 40 police personnel have voluntarily decided to go on quarantine.

"We are actually being over cautious. I have spoken to all the policemen. We know we are in the high-risk job. We are concerned that we might spread it to family members, public, or colleagues. So we want to maintain extreme caution", Illango, who is on home quarantine, told PTI.

With the three personnel testing positive in the state, Kerala Director General of Police Loknath Behera said the force should take all necessary precautions and fearlessly go ahead in the fight against the virus.

The three from Manathavady are believed to have contracted the virus after they came in contact with a man who was called to the station in connection with a case on April 28 and May 2. He later tested positive for COVID-19 on May 9. This man is suspected to be a contact of a truck driver, who has turned out to be a super spreader after returning to the district from Chennai's Koyambedu market, a hotspot, and had infected at least 10 others, including his wife, mother and grandchild.

The Mananthavady police station has been disinfected with the help of the Health Department and Fire Force personnel. Computers and wireless equipment have been shifted to other police buildings and the station's charge has been temporarily given to Vallamunda Station House Officer, a release from the DGP's office said. Two police personnel wearing personal protection equipment (PPE) kits would be at the station to take care of necessary work and a health worker posted to help them, it said.

Police personnel from other stations have been mobilised to meet any shortage, Illangosaid adding they need not come to the police station but directly go to the duty points. Meanwhile, the district health authorities said the standard operating procedure (SOP) has been initiated as soon as the test results of the three came by Wednesday noon. Accordingly, all personnel who were on duty were sent to nearby lodges and resorts for quarantine.

One of the policemen who tested positive had been to Sulthan Bathery police station and Muthanga area, where the DySP and few other officials were also present. This is being seen as a lapse on the part of the police department. However, police sources said none had directed the 24 personnel, whose samples were collected on Monday, to go on quarantine or abstain from duty. The health department is trying to map out the contact list of the police personnel to contain further spread from their direct and secondary contacts.

According to police sources, the Sulthan Bathery Circle Inspector, two sub-inspectors and about 18 police personnel of the Mananthavady police station are among those who have been put on quarantine. As part of containment measures, the courts in Sulthan Bathery and Mananthavady have been closed on Thursday, officials said. 

Chennai, Mar 3: The Madras High Court has ruled that if a working woman gives birth to a child in the second delivery after twins in the first, she is not entitled to maternity benefits as it should be treated as third child.

"As per existing rules, a woman can avail such benefits only for her first two deliveries. Even otherwise it is debatable as to whether the delivery is not a second delivery but a third one, in as much as ordinarily when twins are born they are delivered one after another, and their age and their inter-se elderly status is also determined by virtue of the gap of time between their arrivals, which amounts to two deliveries and not one simultaneous act," the court said.

The first bench, comprising Chief Justice A P Sahi and Justice Subramonium Prasad stated this while allowing the appeal from Ministry of Home Affairs.

It set aside the order June 18 2019 order of a single Judge, who extended 180 days of maternity leave and other benefits to a woman member of the Central Industrial Security Force (CISF) under the rules governing the Tamil Nadu government servants.

The issue pertains to an appeal moved by the ministry, which contended that the leave claim is by a member of CISF to whom the maternity rules of Tamil Nadu would not apply.

She would be covered by the maternity benefits as provided under the Central Civil Services (Leave) Rules, the ministry said.

When the appeal came up for hearing, the bench said it found that a second delivery, which, in the present case, resulted in a third child, cannot be interpreted so as to add to the mathematical precision that is defined in the rules.

The admissibility of benefits would be limited if the claimant has not more than two children, the bench said "This fact therefore changes the entire nature of the relief which is sought for by the woman petitioner, which aspect has been completely overlooked by the single judge", the bench said.