英语语法分析

Methods: Serological monitoring was performed.

方法：血清学监测。

This finding may be of particular importance, because up until now there has been no serological biomarker for use in surveillance programs.

由于到目前为止，还没有血清生物标记物用于癌变监测，因此这一发现具有重要意义。

After the Gambia yellow fever outbreak in 1978-1979, a village-based serological retrospective study estimated some 8000 cases and 1700 deaths had occurred.

冈比亚在1978 - 1979年发生黄热病疫情之后，曾进行过一次以村庄为基础的血清回顾性研究，估计出现过8000个病例，有1700人死亡。