Swine flu is a "sneaky virus" that is likely to keep spreading to new parts of the world and within countries already affected, the head of the World Health Organization said Friday.
At least 42 countries have confirmed cases of the disease, which has sickened 11,168 people and caused 86 deaths, most of them in North America.
"This is a subtle, sneaky virus," WHO's Director-General Margaret Chan said at the close of the global body's annual assembly. "It does not announce its presence or arrival in a new country with a sudden explosion of patients seeking medical care or requiring hospitalization."
Countries need to …
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