https://science.sciencemag.org/content/early/2020/03/13/science.abb3221 https://science.sciencemag.org/content/early/2020/03/13/scie... > We estimate 86% of al

https://science.sciencemag.org/content/early/2020/03/13/science.abb3221 https://science.sciencemag.org/content/early/2020/03/13/scie... > We estimate 86% of all infections were undocumented (95% CI: [82%–90%]) prior to 23 January 2020 travel restrictions. I think that's what GP was talking about.