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The head of the World Health Organisation on Tuesday warned the novel coronavirus was a "very grave threat" for the world as he opened a conference to combat the epidemic.

"With 99% of cases in China, this remains very much an emergency for that country, but one that holds a very grave threat for the rest of the world," Tedros Adhanom Ghebreyesus said in Geneva.

Some 400 scientists will review how the virus is transmitted and possible vaccines at the two-day forum.

"What matters most is stopping the outbreak and saving lives. With your support, that's what we can do together," Tedros said.

The virus, first identified in China on December 31, has killed more than 1,000 people, infected over 42,000 and reached some 25 countries.

Participants will also discuss the source of the virus, which is thought to have originated in bats and reached humans via another animal such as snakes or pangolins.

There is no specific treatment or vaccine against the virus, which can cause respiratory failure.

Tedros, who has repeatedly urged countries affected to share their data, called for global "solidarity".

"That is especially true in relation to the sharing of samples and sequences. To defeat this outbreak, we need open and equitable sharing, according to the principles of fairness and equity," he said.

"We hope that one of the outcomes of this meeting will be an agreed roadmap for research around which researchers and donors will align," Tedros said.

Several companies and institutes in Australia, China, France, Germany and the United States are racing to develop a vaccine -- a process that normally takes years.

Asked whether scientists from Taiwan would be allowed to take part in this week's Geneva conference, WHO officials said that they would do so but only online -- along with colleagues from other parts of China.

While the WHO does not deal with Taiwan directly and only recognises Beijing, Taiwan was often allowed to attend annual assemblies and sideline meetings as an observer.

But in recent years it has been frozen out as Beijing takes an increasingly combative stance towards democratic Taiwan, which it considers its own territory.

New Delhi, Mar 15: The new rules for debit and credit cards to increase security and reduce frauds kick in from Monday. In January, the Reserve Bank of India (RBI) had issued new rules to improve user convenience and increase the security of card transactions. These rules will help in curbing the misuse of debit and credit cards.

RBI has directed banks to allow only domestic card transactions at ATMs and PoS terminals in India at the time of issuance/reissuance of card. For international transactions, online transactions, card-not-present transactions and contactless transactions, customers will have to separately set up services on their card.

These rules will be applicable for new cards from March 16. Those with old cards can decide whether to disable any of these features.

As per the existing rules, these services used to come automatically with the card, but now it will start at the request of the customer.

Debit or credit card customers who have not yet done any online transaction, contactless transaction or international transaction with the card, then these services on the card will automatically stop from March 16.

The Reserve Bank has asked all banks to provide mobile banking, net banking option to enable limit and enable and disable service 24 hours a day, seven days a week.

If the customer makes any change in the status of the card, the bank will alert the customer through SMS/email and send the information.

Issuers shall provide to all cardholders facility to switch on/off and set/modify transaction limits (within the overall card limit, if any, set by the issuer) for all types of transactions -- domestic and international, at PoS/ATMs/online transactions/contactless transactions, etc.,

The provisions, however, are not mandatory for prepaid gift cards and those used at mass transit systems.

The latest instructions come in the wake of rising instances of cyber frauds and the huge increase in the use of cards.