Anne Schuchat of the U. s. Centers for Disease Control and Prevention says the virus cannot be contained, because it is widespread, and officials expect to identify more cases.
美国CDC的Anne Schuchat表示这次的病毒不能被切断传播，因为分布过于广泛，并且官方预计将有更多的病例将确诊。
The U. s. Centers for Disease Control and Prevention on Wednesday confirmed that he had been infected with the swine flu virus.
美国疾病控制和预防周三证实，他感染了猪流感病毒。
The U. s. Centers for Disease Control and Prevention on Wednesday confirmed that he had been infected with the swine flu virus.
美国疾病控制和预防周三证实，他感染了猪流感病毒。
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