An epidemiological survey is a medical survey conducted to discover the source of an infection.

流行病调查是一种医学调查，旨在发现传染病的源头。

An epidemiological survey was carried out in a large urban population.

在大量城市人群中实施了流行病调查。

The leak of personal information of people who took part in epidemiological surveys has sparked public concern about the privacy of patients.

参与流行病调查的人员的个人信息外泄，引发人们对于患者隐私泄露的担忧。

来源同文世纪翻译，转载请注明出处！