See 1. It's Because they were evacuated e.g. from Cruise ships with other symptomatic patients, and were quarantined + tested, it's a CDC standard protocol [2]

See 1. It's Because they were evacuated e.g. from Cruise ships with other symptomatic patients, and were quarantined + tested, it's a CDC standard protocol [2]. They even put one of them down the street from me as we speak [3] 1 - https://www.beckershospitalreview.com/quality/15th-us-coronavirus-case-reported-in-texas-asymptomatic-transmission-confirmed.html https://www.beckershospitalreview.com/quality/15th-us-corona... 2 - https://wwwnc.cdc.gov/travel/yellowbook/2020/posttravel-evaluation/screening-asymptomatic-returned-travelers https://wwwnc.cdc.gov/travel/yellowbook/2020/posttravel-eval... 3 - https://www.pressdemocrat.com/news/10751105-181/sonoma-county-hospital-admits-first https://www.pressdemocrat.com/news/10751105-181/sonoma-count...