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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.

Attari, Mar 19: At least 29 Indians, who had gone to Dubai to watch a cricket match which was called off later, on Wednesday night returned to India through the land transit route of Attari-Wagah border here.

Earlier, when they entered India after being cleared by the Pakistan Immigration Authority, they were detained at Attari border, as they were not having requisite permission on their passport to return to India through Pakistan.

According to officials, they had earlier flown to Dubai from New Delhi to watch a Pakistan League Cricket match there.

The match, however, was aborted and they decided to return India via Pakistan. They took a flight to Pakistan and after landing there, they took land route to reach Attari-Wagah border.

All were cleared by Indian immigration authority after being allowed by the Union Ministry of Home Affairs.

Amritsar Civil Surgeon Dr Prabdeep Kaur Johal said that by 9.30 PM all the Indian nationals were not handed over to the medical team for checkup.

She said if anyone of them are found with any symptoms of the virus, they would be admitted to Amritsar Government Hospital or else they would be allowed to continue their journey to Delhi or elsewhere.

New Delhi, Jun 10: The Enforcement Directorate (ED) on Wednesday brought back over 2,300 kg of polished diamonds and pearls worth Rs 1,350 crore of firms belonging to Nirav Modi and Mehul Choksi from Hong Kong, officials said.

Out of the 108 consignments that landed at Mumbai, 32 belong to overseas entities "controlled" by Modi while the rest are of Mehul Choksi firms.

Both the businessmen are being probed by the ED under the Prevention of Money Laundering Act (PMLA) in connection with an over USD 2 billion alleged bank fraud at a PNB branch in Mumbai.

The valuables include polished diamonds, pearls and silver jewellery, and is worth Rs 1,350 crore. 

The ED completed "all legal formalities" with authorities in Hong Kong to bring back these valuables, the agency said.

These will formally seized under the PMLA now, it said.