https://www.mercurynews.com/2020/05/11/coronavirus-revised-stanford-estimate-says-santa-clara-county-had-54-times-more-cases-than-we-knew-about/

Stanford University researchers have moderated their controversial estimate of how many people in Santa Clara County were infected by the COVID-19 virus by early April — but stand by their conclusion that the illness was much more widespread than anyone knew.

In a revised analysis of a startling study published last month, they now estimate that 2.8% of Santa Clara residents were previously infected by the virus but didn’t know it.