Swine flu continues to take its its toll in Mexico, where the president was among those at the airport as humanitarian aid arrived.
The WHO has set the alert level at five - one short of a full-blown pandemic, but says it has no immediate plans to move to the highest level of six.
Around the world, medical services have been put on alert as the likelihood of a swine flu pandemic grows.
Cases of swine flu have been confirmed in 14 countries. In Japan, tests are being carried out on a student who is feared to have contracted the disease.
Air travellers arriving home from Mexico, where the flu originated, find themselves the subject of scrutiny from health workers tasked with slowing the spread of the virus.
In South Korea, some farmers have been spraying disinfectants at their pig farms as a precautionary measure.
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