Kipchoge wins marathon

[RV Kirgit]

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According to Bloomberg: https://www.bloomberg.com/news/articles/2021-08-02/covid-19-contained-among-olympic-athletes-despite-tokyo-surge

While athletes in the Olympic Village are required to test daily, requirements are less strict for volunteers who have less contact with athletes. The rules are also harsher for those flying in from overseas, compared to Japanese residents.

Given pcr is gene sequencing methodology, what's probability of test tube kipchoge?