每年有4000例新病例被诊断出来。

4,000 new ___cases of the disease are diagnosed every year.

一个罕见的病例引起了国际医学界的关注。

A rare ___case has drawn the attention of the international medical community.

专家们正在密切监测病毒变异是否会导致更严重的病例。

Experts are closely monitoring whether the viral mutation will lead to more severe ___cases.