epidemiological investigation

• 流行病学调查

epidemiological investigation的用法和样例：

例句

1. Epidemiological survey on hookworm disease in Xichang City.
   四川省西昌市钩虫病流行病学调查。
2. An epidemiological investigation of the case was unable to uncover a history of exposure to dead or diseased birds.
   对病例的流行病学调查未发现死禽或病禽接触史。