The CDC issued a level 2 travel advisory for over 30 countries where poliovirus has been detected. What to know before you go ...
23 小时on MSN
What to know about CDC’s new polio alert
Polio is not endemic in the United States, but the disease is circulating in 30 other countries now. A doctor explains how to protect against polio when traveling.
一些您可能无法访问的结果已被隐去。
显示无法访问的结果