"Countries adopting measures which are significantly different...must provide WHO with the public health rationale and relevant scientific information for these measures," said Gregory Hartl, spokesman for the WHO.

For example, China has banned imported pork from areas affected by Type A H1N1, prompting a threat by Canada to file a complaint at the World Trade Organization.

WHO has reiterated that it advises no travel restrictions or border closures. It has also said that there is no risk of infection from the consumption of well-cooked pork and pork products.

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