Rahul Gandhi issues warning, India's COVID-19 count could touch 20 lakh by Aug 10

New Delhi, Apr 15: The Union Health Ministry has identified 170 districts as COVID-19 hotspots and 207 districts as potential hotspots, officials said on Wednesday, reiterating that there has been no community transmission of the disease in the country so far.

Addressing the daily briefing to provide updates on coronavirus situation in the country, Joint Secretary in the Ministry of Health Lav Agarwal said that states have been asked to classify districts which have reported a higher number of cases as hotspots, the districts where cases have been reported as non-hotspots, and green zones where no cases have been reported.

"Hotspots are those districts which are reporting more number of cases or where the rate of growth of COVID-19 cases is high," Agarwal said, adding a detailed direction has been issued to states stating consolidated efforts are required to utilise this period of lockdown to curb the spread of the virus.

"Cabinet secretary held a video conference today with all chief secretaries, DGPs, health secretaries, collectors, SPs, municipal commissioners and CMOs where hotspots were discussed and orientation on field level implementation of containment strategy was given.

"They were told about large outbreak containment strategies, cluster containment strategies. Delineation of buffer and containment zone, parameter mapping, defining of entry and exit points were also discussed in detail," he said.

The joint secretary said movement of people will not be allowed in containment zones except for those related with essential services and special teams will search for new cases and samples will be collected and tested as per sampling criteria.

The officials said that health facilities in buffer zone outside the containment zone will be oriented and people facing SARI and influenza-like symptoms will be tested there.

"Special teams have been formed which will work in containment zone and do contact tracing and house-to-house surveys. Cases of fever, cough and breathlessness will be identified in the survey and requisite action will be taken as per protocol," Agarwal said, adding that there has been no community transmissions so far but some local outbreaks.

The total number of COVID-19 cases in India has risen to 11,439 with 1,076 fresh cases reported in the last 24 hours while the death toll stands at 377, the ministry official said.

Bengaluru, Jun 10: Congress' Rajya Sabha candidate from Karnataka and senior leader Mallikarjun Kharge and his son received threat calls on Sunday, with the latter filing a complaint with the state police chief. Kharge, a former Union Minister, received the call in the wee hours of Sunday on his landline while his son Priyank later got a call from a private number on his mobile phone.

Priyank lodged a complaint with the Director-General of Police Praveen Sood and former MLC Ramesh Babu shared the copy of the complaint on Twitter on Tuesday. In his complaint, Priyank Kharge stated that at about 1.30 am on Sunday, his father received a call on the landline where the caller spoke in Hindi and English and used invective against the Congress veteran.

The caller, according to the complaint, spoke about the Rajya Sabha election and threatened Kharge. Police are looking into the matter. Kharge is the Congress' pick for the June 19 Rajya Sabha election from Karnataka. JD(S) supremo and former Prime Minister Deve Gowda and two BJP candidates have also filed nominations for the election to the upper House.

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.