Comment by Daniel Egnor (daniel-egnor) on COVID-19's Household Secondary Attack Rate Is Unknown · 2020-04-14T00:38:18.065Z · LW · GW

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7104686/

Contact tracing research from Korea. Seems more solid than the "CDC" and "Shenzhen" papers. Estimates a household SAR of 7.56% (95% CI 3.7% - 14.26%), given the (explicitly called out) caveat that these are Korean households of unspecified nature.

I would specifically add to that, given Korea's famously aggressive and successful management program, I would guess that symptomatic household members would have been quickly and isolated, reducing the effective household SAR compared to situations where symptomatic household members continue to interact with the rest of the household.