This has set alarm bells ringing as, until now, only sporadic cases of monkeypox have occurred outside Africa.

这敲响了警钟，因为到目前为止，非洲以外只发生过零星的猴痘病例。

She says sporadic cases and clusters of cases should be efficiently handled to minimize the impacts on people's lives and work.

她说，应高效处置散发病例和聚集性疫情，最大限度地减少对群众生产生活的影响。

V. cholerae O139 – first identified in Bangladesh in 1992 – caused outbreaks in the past, but recently has only been identified in sporadic cases.

O139型霍乱弧菌于1992年在孟加拉国被首次发现，在过去也曾导致霍乱暴发，而最近仅在散发病例中有发现。

The World Health Organization has warned sporadic cases of Ebola are likely to reemerge as the virus can linger on in body fluids of some survivors.

世卫组织发出警告，因病毒会在幸存者体液中残存，零散个例很有可能再次出现。