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United Nations, Jun 6: The coronavirus disease has not "exploded" in India, but the risk of that happening remains as the country moves towards unlocking its nationwide lockdown that was imposed in March to contain the Covid-19, according to a top WHO expert.

WHO Health Emergencies Programme Executive Director Michael Ryan on Friday said the doubling time of the coronavirus cases in India is about three weeks at this stage.

“So the direction of travel of the epidemic is not exponential but it is still growing,” he said, adding that the impact of the pandemic is different in different parts of India and varies between urban and rural settings.

“In South Asia, not just in India but in Bangladesh and...in Pakistan, other countries in South Asia, with large dense populations, the disease has not exploded. But there is always the risk of that happening,” Ryan said in Geneva.

He stressed that as the disease generates and creates a foothold in communities, it can accelerate at any time as has been seen in a number of settings.

Ryan noted that measures taken in India such as the nationwide lockdown have had an impact in slowing transmission but the risk of an increase in cases looms as the country opens up.

“The measures taken in India certainly had an impact in dampening transmission and as India, as in other large countries, open up and as people begin to move again, there's always a risk of the disease bouncing back up,” he said.

He added that there are specific issues in India regarding the large amount of migration, the dense populations in the urban environment and the fact that many workers have no choice but to go to work every day.

India went past Italy to become the sixth worst-hit nation by the COVID-19 pandemic.

India saw a record single-day jump of 9,887 coronavirus cases and 294 deaths on Saturday, pushing the nationwide infection tally to 2,36,657 and the death toll to 6,642, according to the health ministry.

The lockdown in India, was first clamped on March 25 and spanned for 21 days, while the second phase of the curbs began on April 15 and stretched for 19 days till May 3. The third phase of the lockdown was in effect for 14 days and ended on May 17. The fourth phase ended on May 31.

The country had registered 512 coronavirus infection cases till March 24.

The nation-wide lockdown in containment zones will continue till June 30 in India but extensive relaxations in a phased manner from June 8 are listed in the Union home ministry's fresh guidelines on tackling the Covid-19 pandemic issued last week.

WHO Chief Scientist Soumya Swaminathan said the over 200,000 current coronavirus cases in India, a country of over 1.3 billion people, "look big but for a country of this size, it's still modest.”

She stressed that it is important for India to keep track of the growth rate, the doubling time of the virus and to make sure that that number doesn't get worse.

She said that India is a “heterogeneous and huge country” with very densely populated cities and much lower density in some rural areas and varying health systems in different states and these offer challenges to the control of Covid-19.

Swaminathan added that as the lockdown and restrictions are lifted, it must be ensured that all precautions are taken by people.

“We've been making this point repeatedly that really if you want behaviour change at a large level, people need to understand the rationale for asking them to do certain things (such as) wearing masks,” she said.

In many urban areas in India, it's impossible to maintain physical distancing, she said adding that it then becomes very important for people to wear appropriate face coverings when they are out, in office settings, in public transport and educational institutions.

“As some states are thinking about opening, every institution, organisation, industry and sector needs to think about what are the measures that need to be put in place before you can allow a functioning and it may never be back to normal.”

She said that in many professions working from home can be encouraged but in several jobs, people have to go to work and in such cases measures must be put in place that allow people to protect themselves and others.

“I think communication and behaviour change is a very large part of this whole exercise,” she added.

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, Feb 1: Air India's jumbo B747 plane, evacuating 324 Indian nationals from the novel coronavirus-hit Wuhan in China, landed here on Saturday morning, officials said.

The plane reached Delhi around 7.30 am, they said.

There were five doctors from Ram Manohar Lohia (RML) Hospital and one paramedical staff on board, said an Air India spokesperson.

The Indian Army has set up a quarantine facility in Manesar near Delhi to keep those evacuated from China's Hubei province.

Officials said they would be monitored for any signs of infection for a duration of two weeks by a qualified team of doctors and staff members.

"With 324 passengers, special flight has taken off for India from Wuhan. It may reach Delhi at 7.30am," said the Air India spokesperson at 1.19 am on Saturday.

The flight had departed from Delhi airport at 1.17 pm on Friday to evacuate Indian nationals from China, where more than 250 people - none of them Indian - have died due to novel coronavirus.

On Friday evening, the Air India spokesperson had stated that another special flight may take off from Delhi airport on Saturday to evacuate Indians from Wuhan.

The death toll from the novel coronavirus outbreak in China has risen to 259 with total confirmed cases surging to 11,791 amid stepped up efforts by a number of countries to evacuate their nationals from Hubei province, the epicentre of the virus, officials said on Saturday.

About Friday's flight, the spokesperson had said earlier during the day, "A team of five doctors from RML hospital, one paramedical staff from Air India, with prescribed medicines from doctors, masks, overcoats, packed food are in the aircraft. A team of engineers, security personnel are also there in this special aircraft. Whole rescue mission is being led by Captain Amitabh Singh, Director (Operations), Air India."

The spokesperson had added that there were five cockpit crew members and 15 cabin crew members on Friday's flight.

Before departure at Delhi airport, Air India Chairman and Managing Director Ashwani Lohani had said, "No service will take place in the plane. Whatever food is there will be kept in seat pockets. As there will be no service, there will be no interaction (between cabin crew and passengers)."

"Masks have been arranged for the crew and passengers. For our crew, we have also arranged a complete protective gear," he had added.

"Total five doctors from the Health Ministry are also going... The plane will be there (at Wuhan airport) for 2-3 hours," Lohani had said.

Air India has done such evacuations earlier also from countries such as Libya, Iraq, Yemen, Kuwait and Nepal.