Meaning of the word "patient zero" in English

What does "patient zero" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

patient zero

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

Noun

1.

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

Example:
Scientists are still trying to identify patient zero in the recent epidemic.
Understanding patient zero can help trace the spread of a virus.
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