[SCHOOL CLOSINGS: Map of closings related to swine flu]
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[CHAT TRANSCRIPT: Questions answered by local expert]
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Brazilian Health Minister Jose Gomes Temporao says four young adults contracted the flu outside the country, which is home to the continent's largest population.
He says three of them caught the virus in Mexico, and one in Florida. Only one remains hospitalized and is reported in good condition.
Argentine Health Minister Graciela Ocana says the first person sickened by the virus in her country is a man who returned from Mexico on April 25.
He has already been released from the hospital.
Before Thursday, Colombia was the only South American nation to confirm swine flu with its borders.
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