The @World Health Organization (WHO) -convened Global Study of Origins of #SARS-CoV-2 was released on Tuesday and has set the onset date of the earliest #COVID19 case at December 8, 2019. What do we call this “earliest case” in correct scientific term?

For more:
https://news.cgtn.com/news/2021-03-30/WHO-COVID-19-origins-report-Primary-case-vs-index-case-Z3JKDj5Qt2/index.html

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