https://www.mercurynews.com/2020/07/30/9-workers-test-positive-for-covid-19-at-sunnyvale-costco/

Thirty-one workers have tested positive for coronavirus across four different Santa Clara County Costco stores in recent weeks, prompting an investigation, health officials said Thursday.

The largest cluster of cases was reported at the Sunnyvale store at 150 Lawrence Station Rd., where 13 employees tested positive last week, according to Dr. Marty Fenstersheib, leader of the county’s testing task force. Another eight employees fell ill at the San Jose Senter Road store, plus six at a Gilroy store and four at a Mountain View location.