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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, Dec 24: The Delhi Police said that a head constable was killed during clashes over the Citizenship Amendment Act (CAA) in northeast Delhi today.

Deputy Commissioner of Police, Shahdara, Amit Sharma was also injured during clashes, a senior official said. Sharma suffered injuries to his head and hand. He was hospitalised and is doing fine, the official added.

Tension escalated in northeast Delhi with protesters torching at least two houses and a fire tender in the Jaffrabad and Maujpur areas, where pro and anti-CAA groups clashed for the second consecutive day on Monday and hurled stones at each other.

Violence was also reported from the Chandbagh area in Jaffrabad.

Police fired tear gas shells and also resorted to lathicharge to disperse the protesters.

According to officials, a fire tender was damaged by the protesters after it responded to a fire call in the area.

The Delhi Metro closed entry and exit at the Jaffrabad and Maujpur-Babarpur stations as an uneasy calm prevailed in the area.

"Entry & exit of Jaffrabad and Maujpur-Babarpur are closed. Trains will not be halting at these stations," the Delhi Metro Rail Corporation (DMRC) said in a tweet.

Entry and exit were closed at the Jaffrabad metro station for over 24 hours.

Clashes broke out on Sunday evening between pro and anti-CAA groups near Jaffrabad after a large number of people protesting against the Citizenship (Amendment) Act (CAA) blocked a road, while similar sit-ins were launched in several other parts of the national capital.

Delhi chief minister Arvind Kejriwal has urged lieutenant governor of Delhi and the Union home minister to restore order.

Nobody should be allowed to orchestrate violence, he said.

Delhi Lt Governor Anil Baijal instructed the police commissioner to maintain law and order in the national capital in the wake of violence.

"Instructed @DelhiPolice and @CPDelhi to ensure that law and order is maintained in North East Delhi. The situation is being closely monitored. I urge everyone to exercise restraint for maintenance of peace and harmony," Baijal tweeted.

Delhi minister and Babarpur MLA Gopal Rai on Monday urged the people in the area to maintain peace, saying some people were purposely trying to disturb the atmosphere.

"With folded hands, I request people in Babarpur Assembly to maintain peace. Some people are purposely trying to spoil the atmosphere. I have spoken to Delhi LG and he has assured me that more policemen will be deployed to bring the situation under control," Rai said in a tweet.

New Delhi, May 21: As many as 5,609 new COVID-19 cases were reported in India in the last 24 hours, taking the total number of cases in the country to 1,12,359 according to the Union Ministry of Health and Family Welfare.

Out of the total cases, 63,624 are active cases, 45,300 patients have been cured/discharged or have migrated and 3,435 deaths have been reported.

With 39,297 cases in total, Maharashtra remains the worst affected state in the country, followed by Tamil Nadu (13,191 cases), Gujarat (12,537 cases), and Delhi (11,088 cases).

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