We do need to do this type of study in the U.S.... Until we do, we won't know what the population prevalence is.

我们需要在美国做此类研究。直到我们做过，我们才会知道全面的患病率。

youdao

An aging population and the growth of minority populations are expected to add to the disease's prevalence, Albright said.

奥布莱特称，老龄化以及少数族裔人口的增加都有可能使患病人数增加。

youdao

In the same period, TB prevalence halved, from 215 to 108 per 100 000 population.

在同一时期，结核病患病率降低了一半，从每10万人口215例降到108例。

youdao

Botswana has a small population, about two million, but a very big HIV prevalence rate.

VOA: standard.2010.05.10

The researchers modelled the effect of removing sick animals on the disease's prevalence in a small population.

BBC: Cull 'cannot save' Tasmanian devil

The traffic accident survey was designed to establish whether the level of Bovine TB infection in dead badgers, collected from road accidents, reflected disease prevalence in the badger population in the area.

BBC: NEWS | UK | England | Devon | One in seven badgers has TB signs

Nationally, there is much debate over how best to educate the nation's rapidly growing and diverse population of youngsters with autism, the prevalence of which has increased tenfold over the past 25 years.

CNN: From P.S. 176X, kids with autism get joyful launch