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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.

Google on Friday announced the launch of a new feature on Google Search, Assistant, and Maps for users in India to help them find information on COVID-19 testing centres near them.

The search giant has partnered with the Indian Council of Medical Research (ICMR) and MyGov to provide the information on authorised testing labs.

The feature is currently available in English and eight Indian languages including Hindi, Telugu, Tamil, Malayalam, Kannada, Bengali, Gujarati, and Marathi.

According to the company, users will now see a new "Testing" tab on the search result page providing a list of nearby testing labs along with key information and guidance needed before using their services.

On Google Maps, when users search for keywords like "COVID testing" or "coronavirus testing" they will see a list of nearby testing labs, with a link to Google Search for the government-mandated requirements.

Google said that the Search, Assistant, and Maps currently feature 700 testing labs across 300 cities and working with authorities to identify and add more testing labs located across the country.

The company reiterates that it is important to follow the recommended guidelines that help determine testing eligibility before visiting.

New Delhi, May 30: India witnessed the highest ever spike of 7,964 coronavirus positive cases in the last 24 hours, taking the total number of COVID-19 cases in the country to 1,73,763, according to the Union Ministry of Health and Family Welfare.

With as many as 265 deaths reported in the last 24 hours, the death toll due to the virus now stands at 4,971.

Out of the total number of coronavirus cases, 86,422 are active and 82,370 have been cured/discharged/migrated.

Among the states, Maharashtra remains the worst-affected with 62,228 COVID-19 cases, followed by Tamil Nadu (20,246), Delhi (17,386) and Gujarat (15,934).

The fourth phase of the nationwide lockdown imposed as a precautionary measure to contain the spread of COVID-19 is slated to end on Sunday.