A patient who has had contact with at least three positive people and operated one who died from covid-19, had mild symptoms almost three weeks ago, continued to have contact with positives, and is currently asymptomatic. Which test do they recommend? How to act with this patient now? / 有一个案例，他至少与三个阳性患者有接触史，曾给一名已 因新冠死亡的病人做过手术，几乎三周前有过轻微症状，之 后仍与阳性患者有接触，但目 前已无症状。请问您推荐哪种检测，现在应该对这位病人如何处理?