The most recent scare came earlier this year in the Philippines, where a handful of pig-farm workers tested positive for a strain of the Ebola virus that had appeared in local pigs.

• 最近一桩让人担忧的事件今年初发生在菲律宾，当地一些养猪场的工人感染了一种亚型埃博拉病毒，这种病毒此前出现在当地的猪身上。