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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.

An Indian national was killed and four others injured in alleged firing by Nepal police personnel along the India-Nepal border in Bihar's Sitamarhi district today.

Sources said the firing took place after a clash between the Indians and personnel of Nepal police at the Lalbandi-Janki Nagar border in Pipra Parsain panchayat under Sonebarsha police station of the district.

Jitendra Kumar, the additional director general of police (headquarters), confirmed the death and injuries. The place of firing falls under Nepal jurisdiction.

Locals said Vikesh Kumar Rai, 25, died on the spot and Umesh Ram and Uday Thakur received bullet injuries when they were working in an agricultural field. Another person, Lagan Rai, is said to have been detained by the Nepali police.

Injured persons were rushed to Sitamarhi Sadar Hospital for better treatment.

Vikesh Kumar Rai’s father, Nageshwar Rai, said that his agriculture land falls under Narayanpur in Nepal where his son was working.

On May 17, Nepal police had fired blank rounds to disperse dozens of Indians trying to cross the border. It was not clear if they were also farmers.

The district magistrate and the superintendent of police of Sitamarhi have rushed to the spot.

Nepal shares a 1,850-kilometre (1,150-mile) open border with India and people travel across it for work and to visit family. It had closed its international borders on March 22 amid the coronavirus pandemic.

New Delhi, Jul 6: India's COVID-19 tally neared the 7 lakh mark with 6,97,413 cases after 24,248 new cases were reported in the last 24 hours, said the Union Ministry of Health and Family Welfare.

As per the Health Ministry, there are 2,53,287 active cases in the country while 4,24,432 patients have been cured or discharged. While one patient has migrated.

425 new deaths were reported in the last 24 hours in the country due to COVID-19, taking the number of patients succumbing to the deadly virus to 19,693.

As per the Health Ministry, Maharashtra continues to be the most impacted state from the infection with 2,06,619 cases and 8,822 fatalities due to the virus. Tamil Nadu in second place has a total of 1,11,151 cases and 1,510 fatalities.

The national capital's COVID-19 cases are also nearing the 1-lakh mark with 99,444 coronavirus cases and 3,067 deaths.

The total number of samples tested up to July 5 is 99,69,662 of which 1,80,596 samples were tested yesterday, informed the Indian Council of Medical Research on Monday.