Nitish says, Nobody can beat Modi in 2019; slams Congress

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.

New Delhi, Apr 11: As India battles the Covid-19 crisis, Prime Minister Narendra Modi on Saturday held a video conference with chief ministers primarily to take their feedback on whether the 21-nation-wide lockdown be extended beyond April 14 to stem the tide of the infections.

The Central government is understood to have also obtained views on the issue from all the relevant agencies and stakeholders involved in the efforts to contain the spread of the pandemic.

The video conference, which began at 11am, comes amidst indications that the central government may extend the nationwide lockdown with some possible relaxations even as Punjab and Odisha have already announced extending the lockdown beyond April 14 when the current spell of 21-day shutdown across the country ends on Tuesday.

The Union Home Ministry has sought views of state governments on various aspects, including whether more categories of people and services need to be exempted. In the current lockdown only essential services are exempted.

This is for the second time the prime minister is interacting with the chief ministers via video link after the lockdown was imposed.

During his April 2 interaction with chief ministers, Modi had pitched for a "staggered" exit from the ongoing lockdown.

A PTI tally of numbers reported by various states as on Thursday at 9.30pm showed a total of 7,510 having been affected by the virus nationwide so far with at least 251 deaths. More than 700 have been cured and discharged. However, the last update from the Union Health Ministry put the number of confirmed infections at 7,447 and the death toll at 239.

Addressing floor leaders of various parties who have representation in Parliament, Modi had on Wednesday made it clear that the lockdown cannot be lifted in one go, asserting that the priority of his government is to "save each and every life".

According to an official statement after the Wednesday interaction, the prime minister told these leaders that states, district administrations and experts have suggested extension of the lockdown to contain the spread of the virus.

Before the lockdown was announced on March 24, the prime minister had interacted with the chief ministers on March 20 to discuss ways and means to check the spread of the novel coronavirus.

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.