As New York state declares an emergency, experts are far more worried about a resurgence in low-income countries.

中文翻译：

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脊髓灰质炎在富裕国家卷土重来，但大爆发的可能性不大。

随着纽约州宣布进入紧急状态，专家们更加担心低收入国家的复苏。