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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, Apr 24: The death toll due to the novel coronavirus rose to 723 with 37 fatalities reported since Thursday evening, while the number of cases saw a record jump of 1,752 to go up to 23,452 cases on Friday, according to the Union health ministry.

The previous highest single day increase was on April 20 when 1,540 cases were reported.

The number of active COVID-19 cases stood at 17,915 as 4,813 people were cured and discharged, and one patient migrated, the ministry said.

Thus, about 20.52 per cent of the cases have recovered so far, an official of the ministry said. 

The Indian Council of Medical Research (ICMR) said that 23,502 samples have been confirmed positive as on April 24 at 9 am.

The health ministry's figure of 23,452 cases include 77 foreign nationals.

A total of 37 deaths were reported since Thursday evening of which 14 fatalities were reported from Maharashtra, nine from Gujarat, three from Uttar Pradesh, two each from Andhra Pradesh, Delhi, Madhya Pradesh, Tamil Nadu and Telangana and one from Karnataka, the ministry's data stated.

Of the 723 deaths, Maharashtra tops the tally with 283 fatalities, followed by Gujarat at 112, Madhya Pradesh at 83, Delhi at 50, Andhra Pradesh at 29, Rajasthan at 27 and Telengana at 26.

The death toll reached 24 in Uttar Pradesh, 20 in Tamil Nadu while Karantaka has reported 18 deaths.

Punjab has registered 16 deaths while West Bengal has reported 15 fatalities.

The disease has claimed five lives in Jammu and Kashmir, while Kerala, Jharkhand and Haryana have recorded three COVID-19 deaths each.

Bihar has reported two deaths, while Meghalaya, Himachal Pradesh, Odisha and Assam have reported one fatality each, according to the ministry data.

However, a news agency tally of the figures reported by various states as on Friday showed 23,577 cases and 743 deaths in the country.

There has been a lag in the Union health ministry figures, compared to the number of deaths announced by different states, which officials attribute to procedural delays in assigning the cases to individual states.

According to the ministry's data updated in the evening, the highest number of confirmed cases in the country are from Maharashtra at 6,430 followed by Gujarat at 2,624, Delhi at 2,376, Rajasthan at 1,964, Madhya Pradesh at 1,852 and Tamil Nadu at 1,683.

The number of COVID-19 cases has gone up to 1,604 in Uttar Pradesh, 984  in Telangana and 955 in Andhra Pradesh. The number of cases has risen to 514 in West Bengal, 448 in Kerala, 463 in Karnataka, 427 in Jammu and Kashmir,  277 in Punjab and 272 in Haryana.

Bihar has reported 176 coronavirus cases, while Odisha has 90 cases. Fifty-five people have been infected with the virus in Jharkhand and 47 in Uttarakhand. Himachal Pradesh has 40 cases, Chhattisgarh and Assam have registered 36 infections each so far.

Chandigarh has 27 COVID-19 cases, Andaman and Nicobar Islands 22 while  18 cases have been reported from Ladakh.

Meghalaya has reported 12 cases, and Goa and Puducherry have seven COVID-19 cases each.

Manipur and Tripura have two cases each, while Mizoram and Arunachal Pradesh have reported a case each.

"Our figures are being reconciled with the ICMR," the ministry said on its website.

States wise distribution is subject to further verification and reconciliation, it said.