BBC | Governments around the world are hurrying to contain the spread of a new swine flu virus after outbreaks were reported in Mexico, the US and Canada.
At least 100 people are now suspected to have died of the disease in Mexico.
In Europe, health ministers called for an urgent meeting as one case of swine flu was confirmed in Spain.
The UN has warned the virus has the potential to become a pandemic, but said the world was better prepared than ever to deal with the threat.
Stocks of anti-viral medicines are being readied and travellers are being screened at some airports for symptoms.
Mexican Health Secretary Jose Angel Cordova said suspected swine flu cases in his country had risen to 1,614.
Of the 103 deaths in Mexico, only 20 are so far confirmed to have been caused by the new virus.
A public health emergency has been declared in the US, where 20 people are confirmed to have caught the virus.
There are also six confirmed cases in Canada and one in Spain, where at least 17 other people are being tested for the virus.
Investigations are being carried out on possible cases in five other countries.
In most cases outside Mexico, people have been only mildly ill and have made a full recovery.
See map showing confirmed and suspected cases
In other developments:
• Tests are also being carried out on individuals or groups in New Zealand, Australia, Brazil, Britain and Israel who fell ill following travel to Mexico
• World Health Organization (WHO) experts will meet in Geneva on Tuesday to discuss whether to raise the pandemic alert level
• The European Commission also said it was calling an urgent meeting of health ministers to discuss the situation
• The World Bank is providing Mexico with more than $200m in loans to help it deal with the outbreak
• Shares in airlines have fallen sharply on fears about the economic impact of the outbreak
Vigilance urged
The WHO - the UN's health agency - has said the swine flu virus could be capable of mutating into a more dangerous strain.
But officials say they need more information on the virus to determine the threat it poses.
Dr Keiji Fukuda, WHO's assistant director-general in charge of health security, said all countries were "looking at this situation very seriously".
"But it's also clear that we are in a period in which the picture is evolving... [and that] we have to be very careful to collect the best possible information," he said.
The WHO is advising all countries to be vigilant for seasonally unusual flu or pneumonia-like symptoms among their populations - particularly among young healthy adults, a characteristic of past pandemics.
Most of those who have died so far in Mexico were young adults.
The H1N1 virus is the same strain that causes seasonal flu outbreaks in humans but the newly detected version contains genetic material from versions of flu which usually affect pigs and birds.
There is currently no vaccine for the new strain, but severe cases can be treated with antiviral medication. Dr Fukuda said years of preparing for bird flu had boosted world stocks of anti-virals.
Widespread cases
In the US, eight cases have been confirmed among New York students, seven in California, two in Texas, two in Kansas and one in Ohio.
"I do fear that we will have deaths," Dr Anne Schuchat of the US Centers for Disease Control and Prevention (CDC) told reporters.
The Canadian cases were recorded at opposite ends of the country: two in British Columbia in the west, and four in the Atlantic province of Nova Scotia.
In Spain, a young man who had recently returned from Mexico was found to have the virus. He was said to be in a stable condition.
A number of countries in Asia, Latin America and Europe have begun screening airport passengers for symptoms.
Russia, China and Thailand have banned imports of raw pork and pork products from Mexico and parts of the US. But Dr Fukuda said that there was no evidence to link exposure to pork with infection.
In the Mexican capital, schools, bars and public buildings remain closed and many people are choosing to stay indoors.
Some people are beginning to worry about the effects swine flu is having on their livelihoods and the Mexican economy in general.
Fear of the virus is expected to lead to many tourists cancelling their holidays and Mexican exports are already beginning to be affected.
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