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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 14: The number of novel coronavirus cases in India rose to 83 on Saturday, which includes one death each from Delhi and Karnataka, the Union Health Ministry said.

While a 76-year-old man from Kalaburagi who had recently returned from Saudi Arabia died on Thursday, a 68-year-old woman in Delhi who had tested positive for coronavirus passed away at Ram Manohar Lohia (RML) Hospital on Friday night.

The woman, whose son with a travel history abroad had tested positive, died because of co-morbidity (diabetes and hypertension), the Health Ministry said, adding that she had tested positive for COVID-19.

Delhi has reported seven positive cases and Uttar Pradesh 11 so far. Karnataka has six coronavirus patients while Maharashtra has 14 and Ladakh three.

Besides, Rajasthan, Tamil Nadu, Jammu and Kashmir, Andhra Pradesh and Punjab have reported one case each. Telangana has reported two.

Kerala has recorded 19 cases, including three patients who were discharged last month after they recovered from the contagious infection with flu-like symptoms.

The total number of 84 confirmed cases includes 17 foreigners -- 16 Italian tourists and a Canadian, the ministry officials said.

Amid rising coronavirus cases in India, the government has asked people not to panic, saying no community transmission of the virus has been observed and there has only been a few cases of local transmission so far and that is "not a health emergency" in India at present.

With the World Health Organisation (WHO) declaring COVID-19 a pandemic, a Health Ministry official said over 4,000 people who had come in contact with the 83 positive cases have been identified through contract tracing and were being tracked while 42,000 people across the country are under community surveillance.

He said all essential facilities like community surveillance, quarantine, isolation wards, adequate personal protective equipment (PPEs), trained manpower, rapid response teams are being strengthened further in all the states and union territories.

The Centre as part of its measures to contain the spread of the disease on Friday announced that people will be allowed to travel through 19 of 37 land border checkposts from Saturday midnight and services of the Indo-Bangladesh cross border passenger trains and buses will continue to remain suspended till April 15.

Only four Indo-Nepal border checkposts will remain operational, and for citizens of Bhutan and Nepal visa-free entry to the country will continue, Home Ministry Additional Secretary Anil Malik had said.

He said the decision on closing the Kartarpur Corridor is under consideration

The government on Wednesday suspended all visas, barring a few categories like diplomatic and employment, in an attempt to prevent the spread of coronavirus.

It has asked Indian nationals to avoid all non-essential travel abroad.

All incoming international passengers returning to India should self-monitor their health and follow the required do's and dont's as detailed by the government.

New Delhi, May 23: India witnessed the biggest ever spike of 6,654 positive cases in the last 24 hours, taking the total number of COVID-19 cases to 1,25,101, according to the Union Ministry of Health and Family Welfare.

As many as 137 deaths have been reported in the last 24 hours, taking the death toll to 3,720.
Out of the total number of cases, 69,597 are active and 51,784 have been cured/discharged or have migrated.

Maharashtra continues to remain the worst-affected state with 44,582 COVID-19 cases. It is followed by Tamil Nadu (14,753), Gujarat (13,268), and Delhi (12,319).

The nationwide lockdown imposed as a precautionary measure to contain the spread of COVID-19 has been extended till May 31.