Rapid field investigation of new cases, especially when these occur in clusters, remains essential to assess possible changes in transmission patterns that could indicate improved pandemic potential of the virus.

• 对尤其是成群发生的新病例迅速进行实地调查,对于评估传播模式中可能出现的变化仍然至关重要,这些变化可能表明病毒大流行的潜力增强。