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New Delhi, Fevb 10: Of the countries most at risk of importing coronavirus cases, India ranks 17th, researchers have found on the basis of a mathematical model for the expected global spread of the virus that originated in China's Wuhan area in December 2019.

So far, India has reported three coronavirus positive cases -- all from Kerala.

Among the airports in India, the Indira Gandhi International Airport in New Delhi is most at risk, followed by airports in Mumbai, Kolkata, Bengaluru, Chennai, Hyderabad and Kochi, according to the model.

The new model for predicting global novel coronavirus cases has been developed by researchers from Humboldt University and Robert Koch Institute in Germany.

"The spread of the virus on an international scale is dominated by air travel," said the study.

"Wuhan, the seventh largest city in China with 11 million residents, was the relevant major domestic air transportation hub with many connecting international flights before the city was effectively quarantined on January 23, 2020, and the Wuhan airport was closed. By then the virus had already spread to other Chinese provinces as well as other countries," it added.

The researchers said that it is possible to estimate how likely it is that the virus spreads to other areas by looking at air travel passenger numbers.

"The busier a flight route, the more probable it is that an infected passenger travels this route. Using these probabilistic concepts, we calculate the relative import risk to other airports. When calculating the import risk, we also take into account connecting flights and travel routes that involve multiple destinations," said the study.

The top 10 countries and regions at risk of importing coronavirus cases are: Thailand, Japan, South Korea, Hong Kong, Taiwan, USA, Vietnam, Malaysia, Singapore and Cambodia, according to the model.

While Thailand's national import risk is 2.1%, it is 0.2% for India, found the research.

The foundation of the model is the worldwide air transportation network (WAN) that connects approximately 4,000 airports with more than 25,000 direct connections.

The model accounts for both, the current distribution of confirmed cases in mainland China as well as airport closures that were implemented as a mitigation strategy.

This network theoretic model is based on the concept of effective distance and is an extension of a model introduced in the 2013 paper "The Hidden Geometry of Complex, Network-Driven Contagion Phenomena" published in the journal Science.

The current outbreak of the 2019-nCoV virus started in Wuhan city, Hubei province, China. While the first cases were reported as early as December 8, 2019, the outbreak gained global attention on December 31, 2019, when the World Health Organization was alerted to "several cases of pneumonia" by an unknown virus.

The new virus was soon identified as a novel coronavirus and named 2019-nCOV. It belongs to the family of viruses that include the common cold and viruses such as SARS and MERS. On January 20, 2020, it was confirmed that the coronavirus can be transmitted between humans, greatly increasing the risk of a global spread.

The death toll due to the novel coronavirus outbreak in China has increased to 811 on Sunday, surpassing that of the Severe Acute Respiratory Syndrome (SARS) epidemic in 2003.

Although about 20 countries have confirmed cases, China has accounted for about 99 per cent of those infected. The first foreign victims of the virus both died on Saturday in Wuhan.

New Delhi, Jun 10: Delhi recorded 1,366 fresh cases of COVID-19 on Tuesday, taking the tally to 31,309, while the death toll mounted to 905, authorities said on Wednesday.

According to a health bulletin issued by the Delhi government's health department, there are 18,543 active cases, while 11,861 patients have either recovered, been discharged or migrated.

No health bulletin was issued on Tuesday.

Eminent river engineer and former professor of civil engineering at IIT in the Banaras Hindu University (BHU) Prof. U.K. Choudhary has said that the judicious use of river technology can help resolve the Coronavirus crisis as well as the plight of Ganga river.

Choudhary, who is also founder of Ganga Research Centre at IIT (BHU), said: "The Ganga water contains a significantly higher proportion of bacteriophages - a kind of virus that kill bacteria. Our ancient scriptures like Vedas, Puranas and Upanishads say that Ganga jal is medicinal water. Scientists later found that Ganga water has bacteriophages capable of killing pathogens."

Explaining further, he said, "Let us analyze the source of bacteriophages. If we take three rivers of Himalayan origin having sources at different heights -the Ganga (Gomukh), Yamuna (Yamunotri) and the Sone river, we find the colours of waters are different. The whitish colour of Ganga water, greenish colour of Yamuna water and the brownish colour of Sone water is also indicative. As Gomukh is the highest among the three, its water comes from lowest depth of aquifer as compared to Yamunotri and Sone river," he explained.

Thus, the quality of river water is proportional to height of origin point. This defines the genetic character of Ganga water. The balanced flow of this water in entire length of the Ganga defines the medicinal property of Ganga water," he stated.

Prof Chaudhary said that the bacteriophages in the Ganga can curb the spread of coronavirus through soil, water and air.
He suggested that the idea is to preserve the medicinal value of Ganga water and to use it to fight Corona. He said that this can be done by opening the gates of all the dams and barrages in a way that the discharge through each is similar to the water at Gomukh. In this way, the concentration of bacteriophage will be enhanced in Ganga water making it more effective against pathogens.

"With increasing diffusion of bacteriophages in water and soil, the spread of Coronavirus will be impacted and reduced. This methodology and technique can also help maintain the quality of Ganga water later when the problem of Corona ends," he said.