若干国家中的传播已不能追踪到明确界定的人际传播链。
Spread in several countries can no longer be traced to clearly-defined chains of human-to-human transmission.
我们可以充满信心地说，我们现在能够找到每条病毒传播链。
We can say, with confidence, that we can now find every chain of virus transmission.
2009年，在布隆迪发现一起病例，与同一传播链有联系。
In 2009, a case was detected in Burundi, which was linked to the same transmission chain.
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