The World Health Organization declared the first flu pandemic of the 21st century on Thursday, Sweden's health ministry said.
The health ministry said the United Nations agency was raising its pandemic flu alert to the top phase 6 on a six-point scale, indicating the first influenza pandemic since 1968 is under way.
WHO Director-General Dr Margaret Chan was due to give a news conference on the influenza (A) H1N1 pandemic at 1600 GMT, following a meeting of the WHO's emergency committee of flu experts, and WHO spokesmen declined to comment before that.
"Phase 6, if we call a phase 6, doesn't mean anything concerning severity, it is concerning geographic spread ... Pandemic means global, but it doesn't have any connotation of severity or mildness," WHO spokesman Gregory Hartl said.
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