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At least 13 workers have tested positive at Sunnyvale’s Costco at 150 Sunnyvale Station Road and it is still open to customers.
Smaller clusters were also reported at Costco locations in Mountain View, Gilroy and San Jose.
The Santa Clara County Department of Public Health says it is working with stores to investigate the situation.
“The initial investigation shows he was probably not inside the store. The cases were most likely infected outside the workplace,”; said Marty Fenstersheib, a Santa Clara County health officer.
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Essential workers at Bay Area grocery stores have been hit hard by the coronavirus.
A dozen workers at Cardenas Markets in Oakland’s Fruitvale neighborhood tested positive for coronavirus in May.
Eight workers from Trader Joe’s in San Jose tested positive for the virus earlier this month.
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