Mexico, taking a drastic step as confirmed swine flu cases doubled to 99, including eight dead, announced it would temporarily suspend all nonessential activity of the federal government and private business from May 1-5.
"It really is all of humanity that is under threat during a pandemic," WHO Director General Margaret Chan said in Geneva. "We do not have all the answers right now, but we will get them."
It was the first time the WHO had declared a Phase 5 outbreak, the second-highest on its threat scale, indicating a pandemic could be imminent.
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