Improvements of acute flaccid paralysis and measles surveillance performances in response to outbreak of circulating vaccine-derived poliovirus (2021-2022): the case of Southwest Ethiopia Region, Ethiopia

为应对循环疫苗衍生脊髓灰质炎病毒疫情（2021-2022 年），埃塞俄比亚西南部地区急性弛缓性麻痹和麻疹监测绩效的改进：以埃塞俄比亚为例