However, there are no signs that the virus is mutating to become more deadly, as some scientists feared, CDC Director Thomas Frieden said.
CDC主管Thomas Frieden说，然而，科学家担心的病毒更加致命突变迹象尚未出现。
However, there are no signs that the virus is mutating to become more deadly, as some scientists feared, CDC Director Thomas Frieden said.
CDC主管Thomas Frieden说，然而，科学家担心的病毒更加致命突变迹象尚未出现。
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