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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, Mar 25: The Indian Rail Catering and Tourism Corporation (IRCTC) on Wednesday appealed to the people not to cancel their e-tickets on their own in case of trains being cancelled by the national transporter due to nation-wide lockdown to help curb the spread of novel coronavirus pandemic.

Clearing the doubts of the railway passengers, IRCTC spokesperson Siddharth Singh said, "Doubts have been raised regarding cancellation of e-tickets subsequent to the halting of railway passenger trains.

"It may be submitted that for trains cancelled by the railways in its complete run, refund on e-tickets is full and automatic. In this case, no cancellation exercise is required to be done on the part of the user," he said.

The IRCTC official said that if user cancels his e-ticket in situations of train cancellations, there are chances he may get "less refund". "Hence passengers are advised not to cancel e-tickets on their own for those trains which have been cancelled by the railways," he said.

He also said that the refund amount will be credited to the user account used for booking e-tickets automatically and no charges will be deducted by the railways in case of train cancellation.

His remarks came as the national transporter announced the suspension of the passenger, mail and express services from March 23 till March 31. However, the railways extended the suspension of services till April 14 in the wake of the three week lockdown announced by Prime Minister Narendra Modi from March 25 during his second special address to the nation on Tuesday night.

The railways has cancelled over 13,600 passengers trains across the country in a bid to combat the spread of novel coronavirus. Only freight trains are running to ensure the supply of essential services. About 9,000 freight trains are transporting essential items every day across the country.

On Wednesday, India recorded 562 cases of COVID-19 with 10 deaths.

May 18: The Central Board of Secondary Education (CBSE) on Monday announced the date sheet for the pending class 10 and 12 board exams, which will now be held from July 1 to 15.

The exams were postponed due to the nationwide lockdown imposed on March 25 to contain the spread of COVID-19.

The Class 10 board exams are pending only in the North East Delhi.

"The Class 10 exams will be staggered on four dates, starting July 1. The first paper will be Social Science, while the next day students will be required to appear for the Science exam,” said Sanyam Bhardwaj, the Controller of Examination, CBSE.

“On July 10, exams will be conducted for both courses of Hindi and on July 15 for both courses of English," he said.

On health guidelines for students, Bhardwaj said that they will be required to carry their own sanitiser bottles and wear masks to examination centres.

"Parents will have to ensure that their ward is not sick and candidates will have to strictly follow physical-distancing norms," he said.

For Class 12, the Home Science exam will be held on July 1, followed by both courses of Hindi the next day.

The Class 12 Business Studies exam has been scheduled for July 9, followed by Biotechnology on July 10 and Geography on July 11.