Endemicity is described as the measure of disease prevalence in a region.

地方性是衡量一个地区疾病流行度的标准。

Studying disease prevalence and incidence helps us work out where outbreaks are happening.

研究疾病流行率和发病率有助于我们找出疾病在哪里爆发。

Google Flu Trends, run by the eponymous internet firm's charity, monitors flu-related searches to estimate the disease's prevalence.

谷歌流感趋势是互联网公司谷歌的慈善项目，通过监测与流感相关的搜索请求，来估计流感的扩散状况。