patient zero
(Internet slang) Initialism of how embarrassing.
(epidemiology) The initial patient in the population of an epidemiological investigation.
Tending or serving to remind.
(slang, obsolete) Of a person: having a pockmarked face.
疫学者たちは、その旅行歴が感染源の特定に役立った最初の感染者まで感染拡大をさかのぼった。
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