The blood-based serological tests are capable of identifying patients who have been exposed to the coronavirus by looking at their immune response.

基于血液的血清学检测能够通过观察患者的免疫反应来识别接触过冠状病毒的患者。

A local health official says the city plans to conduct serological tests, which target antibodies triggered by a previous infection, on about 5,000 residents in February and March.

一位地方卫生官员表示，北京市计划在 2 月和 3 月对大约 5000 名曾经感染过（新冠病毒）的居民进行血清抗体调查。