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At each stage of development the trematode encounters formidable hazards .

吸虫在发育的每一个阶段，都可能遭遇到极大的风险。

For cases of mixed infection of cestode or trematode praziquantel was used .

发现绦虫和吸虫感染者用吡喹酮驱治。

However , the testicle trematode and pinworm infection ratio is on an upward trend .

但华支睾吸虫和蛲虫感染有上升趋势。