The next stage is then tested in what we call on efficacy trial to see if it actually reduces the rate of chlamydia infection.

该疫苗很大程度上仍处于早期阶段。下一阶段将我们将在药效试验中进行测试，看看它是否真的降低了衣原体感染的几率。

Koalas are extremely prone to chlamydia infections.

考拉极易感染衣原体。