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December 31, 2020, a Costco supermarket chain in Washington State confirmed a mass infection with COVID-19. So far, a total of 145 employees have been diagnosed with COVID-19. At present, all employees diagnosed with COVID-19 have entered isolation.
It is reported that the incident occurred in Yakima County, Washington. The Akima Health Bureau has issued a statement in response to the collective infection, saying that with further testing, marketopeners expect more people to be infected with COVID-19 in the next few days.
Depending on the number and time of infected people, it may be caused by the gathering of employees.