Some 226 swine flu cases have been confirmed in 30 states and more cases are expected, US health officials say.
They said most cases were mild - although a small girl visiting from Mexico has died - and the spread was no worse than seasonal flu.
Mexico, where the outbreak originated, says cases of new infections are declining and authorities will decide on whether to allow schools to reopen.
But the World Health Organization (WHO) has warned against complacency.
WHO chief Margaret Chan said the real test would come when the winter influenza season hits countries.
"We hope the virus fizzles out, because if it doesn't we are heading for a big outbreak," she told the UK's Financial Times. - BBC
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