patient zero

US /ˌpeɪ.ʃənt ˈzɪr.oʊ/
UK /ˌpeɪ.ʃənt ˈzɪr.oʊ/
"patient zero" picture
1.

零号病人, 首例病例

the first person to be identified as carrying an infectious disease in an outbreak of a disease

:
Scientists are still trying to identify patient zero in the recent epidemic.
科学家们仍在努力确定最近疫情中的零号病人
Understanding patient zero can help trace the spread of a virus.
了解零号病人有助于追踪病毒的传播。