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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, Feb 5: Delhi High Court on Wednesday stated that that death warrant of all convicts in the Nirbhaya gangrape and murder case should be executed together.

The Delhi prison rules do not state whether when the mercy petition of one convict is pending, the execution of the other convicts can take place and from the trial court to Supreme Court all convicts have been held by a common order and a common judgment, Justice Suresh Kumar Kait observed while passing the order.

High Court dismissed the Central government and Tihar Jail authorities plea challenging the Patiala House court's order, which stayed the execution of the four convicts in the case. It also observed that the convicts indulged in a heinous offence of a bone-chilling rape and murder of a girl and that criminal appeals by all convicts were dismissed by the courts.

Moreover, the court observed that the review petitions were filed after long wait and convicts are taking shelter of Article 21 which is available to them till their last breath.

A single-judge bench of Justice Suresh Kumar Kait had on Sunday kept the order reserved in the matter after special hearing of two days.

Earlier, Solicitor General Tushar Mehta, appearing on behalf of the Centre, alleged that the convicts were deliberately delaying the execution, adding that any delay in death sentence will have a dehumanising effect on the convicts.

A Delhi court last week stayed till further orders the execution of the four convicts -- Akshay Thakur, Mukesh Singh, Pawan Gupta, and Vinay Sharma -- which was earlier scheduled to take place on February 1.

The case pertains to the gang-rape and brutal murder of a 23-year-old paramedical student in a moving bus on the night of December 16, 2012, by six people, including a juvenile, in Delhi. The woman had died at a Singapore hospital a few days later.

One of the five adults accused, Ram Singh, had allegedly committed suicide in the Tihar Jail during the trial of the case.